diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..1855535
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,3 @@
+[profile.release]
+lto = "thin"
+strip = true
diff --git a/.drone.jsonnet b/.drone.jsonnet
new file mode 100644
index 0000000..d6fcd1a
--- /dev/null
+++ b/.drone.jsonnet
@@ -0,0 +1,92 @@
+local executableName = 'fourth';
+local build_image = 'img.kie.rs/jjkiers/rust-cross:rust1.70-zig';
+
+local archs = [
+  { target: 'aarch64-unknown-linux-musl', short: 'arm64-musl' },
+  { target: 'x86_64-pc-windows-gnu', short: 'windows' },
+  { target: 'x86_64-unknown-linux-musl', short: 'amd64-musl' },
+];
+
+local getStepName(arch) = 'Build for ' + arch.short;
+
+local builtExecutableName(arch) = executableName + if std.length(std.findSubstr(arch.short, 'windows')) > 0 then '.exe' else '';
+local targetExecutableName(arch) = executableName + '-' + arch.target + if std.length(std.findSubstr(arch.short, 'windows')) > 0 then '.exe' else '';
+
+local getVolumeName(arch) = 'target-' + arch.target;
+local getLocalVolumes(arch) = [
+  {
+    name: getVolumeName(arch),
+    temp: {},
+  }
+  for arch in archs
+];
+
+local add_build_steps() = [
+  {
+    name: getStepName(arch),
+    image: build_image,
+    commands: [
+      'echo Hello World from Jsonnet on ' + arch.target + '!',
+      'cargo zigbuild --release --target ' + arch.target,
+      'cp target/' + arch.target + '/release/' + builtExecutableName(arch) + ' artifacts/' + targetExecutableName(arch),
+      'rm -rf target/' + arch.target + '/release/*',
+    ],
+    depends_on: ['Prepare'],
+    volumes: [{
+      name: getVolumeName(arch),
+      path: '/drone/src/target',
+    }],
+  }
+  for arch in archs
+];
+
+{
+  kind: 'pipeline',
+  type: 'docker',
+  name: 'default',
+  platform: {
+    arch: 'amd64',
+  },
+  steps:
+    [{
+      name: 'Prepare',
+      image: build_image,
+      commands: [
+        'mkdir artifacts',
+        'echo Using image: ' + build_image,
+        'cargo --version',
+        'rustc --version',
+      ],
+    }] +
+    add_build_steps() +
+    [
+      {
+        name: 'Show built artifacts',
+        image: build_image,
+        commands: [
+          'ls -lah artifacts',
+        ],
+        depends_on: [getStepName(a) for a in archs],
+      },
+      {
+        name: 'Create release on gitea',
+        image: 'plugins/gitea-release',
+        settings: {
+          api_key: {
+            from_secret: 'gitea_token',
+          },
+          base_url: 'https://code.kiers.eu',
+          files: 'artifacts/*',
+          checksum: 'sha256',
+        },
+        when: {
+          event: ['tag', 'promote'],
+        },
+        depends_on: ['Show built artifacts'],
+      },
+    ],
+
+  volumes: getLocalVolumes(archs),
+
+  image_pull_secrets: ['docker_private_repo'],
+}
diff --git a/.github/workflows/publish-binaries.yml b/.github/workflows/publish-binaries.yml
deleted file mode 100644
index 2a3fd56..0000000
--- a/.github/workflows/publish-binaries.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-on:
-  release:
-    types: [published]
-
-name: Publish binaries to release
-
-jobs:
-  publish:
-    name: Publish for ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-        include:
-          - os: ubuntu-latest
-            artifact_name: fourth
-            asset_name: fourth-linux-amd64
-          - os: macos-latest
-            artifact_name: fourth
-            asset_name: fourth-macos-amd64
-          - os: windows-latest
-            artifact_name: fourth.exe
-            asset_name: fourth-windows-amd64.exe
-    
-    steps:
-      - uses: hecrj/setup-rust-action@master
-        with:
-          rust-version: stable
-      - uses: actions/checkout@v2
-      - name: Build
-        run: cargo build --release --locked
-      - name: Publish
-        uses: svenstaro/upload-release-action@v1-release
-        with:
-          repo_token: ${{ secrets.PUBLISH_TOKEN }}
-          file: target/release/${{ matrix.artifact_name }}
-          asset_name: ${{ matrix.asset_name }}
-          tag: ${{ github.ref }}
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
deleted file mode 100644
index 05fab7b..0000000
--- a/.github/workflows/rust.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: Rust
-
-on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-
-env:
-  CARGO_TERM_COLOR: always
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Upgrade Rust
-      run: rustup update
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
diff --git a/.gitignore b/.gitignore
index ea8c4bf..59b2d02 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /target
+config.yaml
diff --git a/Cargo.lock b/Cargo.lock
index 0b2e718..48e7cbf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,10 +3,25 @@
 version = 3
 
 [[package]]
-name = "aho-corasick"
-version = "1.0.1"
+name = "addr2line"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67fc08ce920c31afb70f013dcce1bfc3a3195de6a228474e45e1f145b36f8d04"
+checksum = "f4fa78e18c64fce05e902adecd7a5eed15a5e0a3439f7b0e169f0252214865e3"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "aho-corasick"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6748e8def348ed4d14996fa801f4122cd763fff530258cdc03f64b25f89d3a5a"
 dependencies = [
  "memchr",
 ]
@@ -28,6 +43,21 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "backtrace"
+version = "0.3.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4319208da049c43661739c5fade2ba182f09d1dc2299b32298d3a31692b17e12"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -46,12 +76,27 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
 
+[[package]]
+name = "cc"
+version = "1.0.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "305fe645edc1442a0fa8b6726ba61d422798d37a52e12eaecf4b022ebbb88f01"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "deranged"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7684a49fb1af197853ef7b2ee694bc1f5b4179556f1e5710e1760c5db6f5e929"
+
 [[package]]
 name = "enum_primitive"
 version = "0.1.1"
@@ -75,10 +120,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "form_urlencoded"
-version = "1.1.0"
+name = "equivalent"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9c384f161156f5260c24a097c56119f9be8c798586aecc13afbcbe7b7e26bf8"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
+[[package]]
+name = "form_urlencoded"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a62bc1cf6f830c2ec14a513a9fb124d0a213a629668a4186f329db21fe045652"
 dependencies = [
  "percent-encoding",
 ]
@@ -156,7 +207,7 @@ checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn 2.0.28",
 ]
 
 [[package]]
@@ -191,9 +242,9 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "libc",
@@ -201,10 +252,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "hashbrown"
-version = "0.12.3"
+name = "gimli"
+version = "0.27.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+checksum = "b6c80984affa11d98d1b88b66ac8853f143217b399d3c74116778ff8fdb4ed2e"
+
+[[package]]
+name = "hashbrown"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
 
 [[package]]
 name = "hermit-abi"
@@ -217,12 +274,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.2.6"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee512640fe35acbfb4bb779db6f0d80704c2cacfa2e39b601ef3e3f47d1ae4c7"
-dependencies = [
- "libc",
-]
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
 
 [[package]]
 name = "humantime"
@@ -235,9 +289,9 @@ dependencies = [
 
 [[package]]
 name = "idna"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
+checksum = "7d20d6b07bfbc108882d88ed8e37d39636dcc260e15e30c45e6ba089610b917c"
 dependencies = [
  "unicode-bidi",
  "unicode-normalization",
@@ -245,31 +299,31 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "1.9.3"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
+checksum = "d5477fe2230a79769d8dc68e0eabf5437907c0457a5614a9e8dddb67f65eb65d"
 dependencies = [
- "autocfg",
+ "equivalent",
  "hashbrown",
 ]
 
 [[package]]
 name = "itoa"
-version = "1.0.6"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "libc"
-version = "0.2.144"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b00cc1c228a6782d0f076e7b232802e0c5689d41bb5df366f2a6b6621cfdfe1"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "lock_api"
-version = "0.4.9"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
+checksum = "c1cc9717a20b1bb222f333e6a92fd32f7d8a18ddc5a3191a11af45dcbf4dcd16"
 dependencies = [
  "autocfg",
  "scopeguard",
@@ -277,9 +331,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.18"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "518ef76f2f87365916b142844c16d8fefd85039bc5699050210a7778ee1cd1de"
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "memchr"
@@ -293,6 +347,15 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
 
+[[package]]
+name = "miniz_oxide"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
+dependencies = [
+ "adler",
+]
+
 [[package]]
 name = "mio"
 version = "0.8.8"
@@ -301,7 +364,7 @@ checksum = "927a765cd3fc26206e66b296465fa9d3e5ab003e651c1b3c060e7956d96b19d2"
 dependencies = [
  "libc",
  "wasi",
- "windows-sys 0.48.0",
+ "windows-sys",
 ]
 
 [[package]]
@@ -342,25 +405,25 @@ version = "0.1.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92e5113e9fd4cc14ded8e499429f396a20f98c772a47cc8622a736e1ec843c31"
 dependencies = [
- "num-traits 0.2.15",
+ "num-traits 0.2.16",
 ]
 
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "f30b0abd723be7e2ffca1272140fac1a2f084c77ec3e123c192b66af1ee9e6c2"
 dependencies = [
  "autocfg",
 ]
 
 [[package]]
 name = "num_cpus"
-version = "1.15.0"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fac9e2da13b5eb447a6ce3d392f23a29d8694bff781bf03a16cd9ac8697593b"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi 0.2.6",
+ "hermit-abi 0.3.2",
  "libc",
 ]
 
@@ -373,6 +436,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "object"
+version = "0.31.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8bda667d9f2b5051b8833f59f3bf748b28ef54f850f4fcb389a252aa383866d1"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.12.1"
@@ -385,22 +457,22 @@ dependencies = [
 
 [[package]]
 name = "parking_lot_core"
-version = "0.9.7"
+version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9069cbb9f99e3a5083476ccb29ceb1de18b9118cafa53e90c9551235de2b9521"
+checksum = "93f00c865fe7cabf650081affecd3871070f26767e7b2070a3ffae14c654b447"
 dependencies = [
  "cfg-if",
  "libc",
  "redox_syscall",
  "smallvec",
- "windows-sys 0.45.0",
+ "windows-targets",
 ]
 
 [[package]]
 name = "percent-encoding"
-version = "2.2.0"
+version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "478c572c3d73181ff3c2539045f6eb99e5491218eae919370993b890cdbdd98e"
+checksum = "9b2a4787296e9989611394c33f193f676704af1686e70b8f8033ab5ba9a35a94"
 
 [[package]]
 name = "phf"
@@ -442,9 +514,9 @@ dependencies = [
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.9"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
+checksum = "12cc1b0bf1727a77a54b6654e7b5f1af8604923edc8b81885f8ec92f9e3f0a05"
 
 [[package]]
 name = "pin-utils"
@@ -470,9 +542,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.59"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6aeca18b86b413c660b781aa319e4e2648a3e6f9eadc9b47e9038e6fe9f3451b"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
@@ -485,9 +557,9 @@ checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
 
 [[package]]
 name = "quote"
-version = "1.0.28"
+version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b9ab9c7eadfd8df19006f1cf1a4aed13540ed5cbc047010ece5826e10825488"
+checksum = "50f3b39ccfb720540debaa0164757101c08ecb8d326b15358ce76a62c7e85965"
 dependencies = [
  "proc-macro2",
 ]
@@ -524,18 +596,30 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.2.16"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
+checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
 dependencies = [
  "bitflags",
 ]
 
 [[package]]
 name = "regex"
-version = "1.8.3"
+version = "1.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81ca098a9821bd52d6b24fd8b10bd081f47d39c22778cafaa75a2857a62c6390"
+checksum = "81bc1d4caf89fac26a70747fe603c130093b53c773888797a6329091246d651a"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fed1ceff11a1dddaee50c9dc8e4938bd106e9d89ae372f192311e7da498e3b69"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -544,9 +628,15 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.7.2"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "436b050e76ed2903236f032a59761c1eb99e1b0aead2c257922771dab1fc8c78"
+checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
 [[package]]
 name = "rusticata-macros"
@@ -559,47 +649,47 @@ dependencies = [
 
 [[package]]
 name = "rustversion"
-version = "1.0.12"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f3208ce4d8448b3f3e7d168a73f5e0c43a61e32930de3bceeccedb388b6bf06"
+checksum = "7ffc183a10b4478d04cbbbfc96d0873219d962dd5accaff2ffbd4ceb7df837f4"
 
 [[package]]
 name = "ryu"
-version = "1.0.13"
+version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
+checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
 
 [[package]]
 name = "scopeguard"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
 [[package]]
 name = "serde"
-version = "1.0.163"
+version = "1.0.183"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2113ab51b87a539ae008b5c6c02dc020ffa39afd2d83cffcb3f4eb2722cebec2"
+checksum = "32ac8da02677876d532745a130fc9d8e6edfa81a269b107c5b00829b91d8eb3c"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.163"
+version = "1.0.183"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c805777e3930c8883389c602315a24224bcc738b63905ef87cd1420353ea93e"
+checksum = "aafe972d60b0b9bee71a91b92fee2d4fb3c9d7e8f6b179aa99f27203d99a4816"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn 2.0.28",
 ]
 
 [[package]]
 name = "serde_yaml"
-version = "0.9.21"
+version = "0.9.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9d684e3ec7de3bf5466b32bd75303ac16f0736426e5a4e0d6e489559ce1249c"
+checksum = "1a49e178e4452f45cb61d0cd8cebc1b0fafd3e41929e996cef79aa3aca91f574"
 dependencies = [
  "indexmap",
  "itoa",
@@ -634,18 +724,18 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.10.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
+checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
 
 [[package]]
 name = "socket2"
-version = "0.4.9"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64a4a911eed85daf18834cfaa86a79b7d266ff93ff5ba14005426219480ed662"
+checksum = "2538b18701741680e0322a2302176d3253a35388e2e62f172f64f4f16605f877"
 dependencies = [
  "libc",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -661,9 +751,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.18"
+version = "2.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32d41677bcbe24c20c52e7c70b0d8db04134c5d1066bf98662e2871ad200ea3e"
+checksum = "04361975b3f5e348b2189d8dc55bc942f278b2d482a6a0365de5bdd62d351567"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -681,10 +771,11 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.21"
+version = "0.3.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f3403384eaacbca9923fa06940178ac13e4edb725486d70e8e15881d0c836cc"
+checksum = "b0fdd63d58b18d663fbdf70e049f00a22c8e42be082203be7f26589213cd75ea"
 dependencies = [
+ "deranged",
  "itoa",
  "libc",
  "num_threads",
@@ -701,9 +792,9 @@ checksum = "7300fbefb4dadc1af235a9cef3737cea692a9d97e1b9cbcd4ebdae6f8868e6fb"
 
 [[package]]
 name = "time-macros"
-version = "0.2.9"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "372950940a5f07bf38dbe211d7283c9e6d7327df53794992d293e534c733d09b"
+checksum = "eb71511c991639bb078fd5bf97757e03914361c48100d52878b8e52b46fb92cd"
 dependencies = [
  "time-core",
 ]
@@ -739,11 +830,11 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.28.2"
+version = "1.31.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94d7b1cfd2aa4011f2de74c2c4c63665e27a71006b0a192dcd2710272e73dfa2"
+checksum = "40de3a2ba249dcb097e01be5e67a5ff53cf250397715a071a81543e8a832a920"
 dependencies = [
- "autocfg",
+ "backtrace",
  "bytes",
  "libc",
  "mio",
@@ -753,7 +844,7 @@ dependencies = [
  "signal-hook-registry",
  "socket2",
  "tokio-macros",
- "windows-sys 0.48.0",
+ "windows-sys",
 ]
 
 [[package]]
@@ -764,7 +855,7 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn 2.0.28",
 ]
 
 [[package]]
@@ -775,9 +866,9 @@ checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.9"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b15811caf2415fb889178633e7724bad2509101cde276048e013b9def5e51fa0"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "unicode-normalization"
@@ -790,15 +881,15 @@ dependencies = [
 
 [[package]]
 name = "unsafe-libyaml"
-version = "0.2.8"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1865806a559042e51ab5414598446a5871b561d21b6764f2eabb0dd481d880a6"
+checksum = "f28467d3e1d3c6586d8f25fa243f544f5800fec42d97032474e17222c2b75cfa"
 
 [[package]]
 name = "url"
-version = "2.3.1"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+checksum = "50bff7831e19200a85b17131d085c25d7811bc4e186efdaf54bbd132994a88cb"
 dependencies = [
  "form_urlencoded",
  "idna",
@@ -842,134 +933,68 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
-[[package]]
-name = "windows-sys"
-version = "0.45.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
-dependencies = [
- "windows-targets 0.42.2",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
- "windows-targets 0.48.0",
+ "windows-targets",
 ]
 
 [[package]]
 name = "windows-targets"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
+checksum = "d1eeca1c172a285ee6c2c84c341ccea837e7c01b12fbb2d0fe3c9e550ce49ec8"
 dependencies = [
- "windows_aarch64_gnullvm 0.42.2",
- "windows_aarch64_msvc 0.42.2",
- "windows_i686_gnu 0.42.2",
- "windows_i686_msvc 0.42.2",
- "windows_x86_64_gnu 0.42.2",
- "windows_x86_64_gnullvm 0.42.2",
- "windows_x86_64_msvc 0.42.2",
-]
-
-[[package]]
-name = "windows-targets"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b1eb6f0cd7c80c79759c929114ef071b87354ce476d9d94271031c0497adfd5"
-dependencies = [
- "windows_aarch64_gnullvm 0.48.0",
- "windows_aarch64_msvc 0.48.0",
- "windows_i686_gnu 0.48.0",
- "windows_i686_msvc 0.48.0",
- "windows_x86_64_gnu 0.48.0",
- "windows_x86_64_gnullvm 0.48.0",
- "windows_x86_64_msvc 0.48.0",
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
 ]
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
-
-[[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
+checksum = "b10d0c968ba7f6166195e13d593af609ec2e3d24f916f081690695cf5eaffb2f"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
-
-[[package]]
-name = "windows_aarch64_msvc"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
+checksum = "571d8d4e62f26d4932099a9efe89660e8bd5087775a2ab5cdd8b747b811f1058"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
-
-[[package]]
-name = "windows_i686_gnu"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
+checksum = "2229ad223e178db5fbbc8bd8d3835e51e566b8474bfca58d2e6150c48bb723cd"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
-
-[[package]]
-name = "windows_i686_msvc"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+checksum = "600956e2d840c194eedfc5d18f8242bc2e17c7775b6684488af3a9fff6fe3287"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
-
-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
+checksum = "ea99ff3f8b49fb7a8e0d305e5aec485bd068c2ba691b6e277d29eaeac945868a"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
-
-[[package]]
-name = "windows_x86_64_gnullvm"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+checksum = "8f1a05a1ece9a7a0d5a7ccf30ba2c33e3a61a30e042ffd247567d1de1d94120d"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.42.2"
+version = "0.48.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
-
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.48.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+checksum = "d419259aba16b663966e29e6d7c6ecfa0bb8425818bb96f6f1f3c3eb71a6e7b9"
diff --git a/Cargo.toml b/Cargo.toml
index dcbe18f..573eeca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,6 @@ futures = "0.3"
 tls-parser = "0.11"
 url = "2.2.2"
 time = { version = "0.3.1", features = ["local-offset", "formatting"] }
-
 tokio = { version = "1.0", features = ["full"] }
 
 bytes = "1.1"
diff --git a/README-EN.md b/README-EN.md
deleted file mode 100644
index 338de75..0000000
--- a/README-EN.md
+++ /dev/null
@@ -1,70 +0,0 @@
-# Fourth
-
-> Hey, now we are on level 4!
-
-[![](https://img.shields.io/crates/v/fourth)](https://crates.io/crates/fourth) [![CI](https://img.shields.io/github/workflow/status/kernelerr/fourth/Rust)](https://github.com/KernelErr/fourth/actions/workflows/rust.yml)
-
-**Under heavy development, version 0.1 may update frequently**
-
-Fourth is a layer 4 proxy implemented by Rust to listen on specific ports and transfer TCP/KCP data to remote addresses(only TCP) according to configuration.
-
-## Features
-
-- Listen on specific port and proxy to local or remote port
-- SNI-based rule without terminating TLS connection
-- Allow KCP inbound(warning: untested)
-
-## Installation
-
-To gain best performance on your computer's architecture, please consider build the source code. First, you may need [Rust tool chain](https://rustup.rs/).
-
-```bash
-$ cd fourth
-$ cargo build --release
-```
-
-Binary file will be generated at `target/release/fourth`, or you can use `cargo install --path .` to install.
-
-Or you can use Cargo to install Fourth:
-
-```bash
-$ cargo install fourth
-```
-
-Or you can download binary file form the Release page.
-
-## Configuration
-
-Fourth will read yaml format configuration file from `/etc/fourth/config.yaml`, and you can set custom path to environment variable `FOURTH_CONFIG`, here is an minimal viable example:
-
-```yaml
-version: 1
-log: info
-
-servers:
-  proxy_server:
-    listen:
-      - "127.0.0.1:8081"
-    default: remote
-
-upstream:
-  remote: "tcp://www.remote.example.com:8082" # proxy to remote address
-```
-
-Built-in two upstreams: ban(terminate connection immediately), echo. For detailed configuration, check [this example](./example-config.yaml).
-
-## Performance Benchmark
-
-Tested on 4C2G server:
-
-Use fourth to proxy to Nginx(QPS of direct connection: ~120000): ~70000 req/s (Command: `wrk -t200 -c1000 -d120s --latency http://proxy-server:8081`)
-
-Use fourth to proxy to local iperf3: 8Gbps
-
-## Thanks
-
-- [tokio_kcp](https://github.com/Matrix-Zhang/tokio_kcp)
-
-## License
-
-Fourth is available under terms of Apache-2.0.
\ No newline at end of file
diff --git a/README-ZH.md b/README-ZH.md
new file mode 100644
index 0000000..c2434f2
--- /dev/null
+++ b/README-ZH.md
@@ -0,0 +1,80 @@
+# Fourth
+
+> 这一波在第四层。
+
+[![](https://img.shields.io/crates/v/fourth)](https://crates.io/crates/fourth) [![CI](https://img.shields.io/github/workflow/status/kernelerr/fourth/Rust)](https://github.com/KernelErr/fourth/actions/workflows/rust.yml)
+
+[English](/README-EN.md)
+
+**积极开发中，0.1版本迭代可能较快**
+
+Fourth是一个Rust实现的Layer 4代理，用于监听指定端口TCP/KCP流量，并根据规则转发到指定目标（目前只支持TCP）。
+
+## 功能
+
+- 监听指定端口代理到本地或远端指定端口
+- 监听指定端口，通过TLS ClientHello消息中的SNI进行分流
+- 支持KCP入站（警告：未测试）
+
+## 安装方法
+
+为了确保获得您架构下的最佳性能，请考虑自行编译，首选需要确保您拥有[Rust工具链](https://rustup.rs/)。
+
+```bash
+$ cd fourth
+$ cargo build --release
+```
+
+将在`target/release/fourth`生成二进制文件，您也可以使用`cargo install --path . `来安装二进制文件。
+
+或者您也可以使用Cargo直接安装：
+
+```bash
+$ cargo install fourth
+```
+
+或者您也可以直接从Release中下载二进制文件。
+
+## 配置
+
+Fourth使用yaml格式的配置文件，默认情况下会读取`/etc/fourth/config.yaml`，您也可以设置自定义路径到环境变量`FOURTH_CONFIG`，如下是一个最小有效配置：
+
+```yaml
+version: 1
+log: info
+
+servers:
+  proxy_server:
+    listen:
+      - "127.0.0.1:8081"
+    default: remote
+
+upstream:
+  remote: "tcp://www.remote.example.com:8082" # proxy to remote address
+```
+
+内置两个的upstream：ban（立即中断连接）、echo（返回读到的数据）。更详细的配置可以参考[示例配置](./example-config.yaml)。
+
+注意：[::]会默认同时绑定IPv4和IPv6。
+
+## 性能测试
+
+在4C2G的服务器上测试：
+
+使用Fourth代理到Nginx（直连QPS 120000）: ~70000req/s （测试命令：`wrk -t200 -c1000 -d120s --latency http://proxy-server:8081 `）
+
+使用Fourth代理到本地iperf3：8Gbps
+
+## io_uring?
+
+尽管经过了很多尝试，我们发现目前一些Rust下面的io_uring实现存在问题，我们使用的io_uring库实现尽管在吞吐量上可以做到单线程20Gbps（相比之下Tokio仅有8Gbps），但在QPS上存在性能损失较大的问题。因此在有成熟的io_uring实现之前，我们仍然选择epoll。之后我们会持续关注相关进展。
+
+可能以后会为Linux高内核版本的用户提供可选的io_uring加速。
+
+## 感谢
+
+- [tokio_kcp](https://github.com/Matrix-Zhang/tokio_kcp)
+
+## 协议
+
+Fourth以Apache-2.0协议开源。
diff --git a/README.md b/README.md
index c2434f2..338de75 100644
--- a/README.md
+++ b/README.md
@@ -1,43 +1,41 @@
 # Fourth
 
-> 这一波在第四层。
+> Hey, now we are on level 4!
 
 [![](https://img.shields.io/crates/v/fourth)](https://crates.io/crates/fourth) [![CI](https://img.shields.io/github/workflow/status/kernelerr/fourth/Rust)](https://github.com/KernelErr/fourth/actions/workflows/rust.yml)
 
-[English](/README-EN.md)
+**Under heavy development, version 0.1 may update frequently**
 
-**积极开发中，0.1版本迭代可能较快**
+Fourth is a layer 4 proxy implemented by Rust to listen on specific ports and transfer TCP/KCP data to remote addresses(only TCP) according to configuration.
 
-Fourth是一个Rust实现的Layer 4代理，用于监听指定端口TCP/KCP流量，并根据规则转发到指定目标（目前只支持TCP）。
+## Features
 
-## 功能
+- Listen on specific port and proxy to local or remote port
+- SNI-based rule without terminating TLS connection
+- Allow KCP inbound(warning: untested)
 
-- 监听指定端口代理到本地或远端指定端口
-- 监听指定端口，通过TLS ClientHello消息中的SNI进行分流
-- 支持KCP入站（警告：未测试）
+## Installation
 
-## 安装方法
-
-为了确保获得您架构下的最佳性能，请考虑自行编译，首选需要确保您拥有[Rust工具链](https://rustup.rs/)。
+To gain best performance on your computer's architecture, please consider build the source code. First, you may need [Rust tool chain](https://rustup.rs/).
 
 ```bash
 $ cd fourth
 $ cargo build --release
 ```
 
-将在`target/release/fourth`生成二进制文件，您也可以使用`cargo install --path . `来安装二进制文件。
+Binary file will be generated at `target/release/fourth`, or you can use `cargo install --path .` to install.
 
-或者您也可以使用Cargo直接安装：
+Or you can use Cargo to install Fourth:
 
 ```bash
 $ cargo install fourth
 ```
 
-或者您也可以直接从Release中下载二进制文件。
+Or you can download binary file form the Release page.
 
-## 配置
+## Configuration
 
-Fourth使用yaml格式的配置文件，默认情况下会读取`/etc/fourth/config.yaml`，您也可以设置自定义路径到环境变量`FOURTH_CONFIG`，如下是一个最小有效配置：
+Fourth will read yaml format configuration file from `/etc/fourth/config.yaml`, and you can set custom path to environment variable `FOURTH_CONFIG`, here is an minimal viable example:
 
 ```yaml
 version: 1
@@ -53,28 +51,20 @@ upstream:
   remote: "tcp://www.remote.example.com:8082" # proxy to remote address
 ```
 
-内置两个的upstream：ban（立即中断连接）、echo（返回读到的数据）。更详细的配置可以参考[示例配置](./example-config.yaml)。
+Built-in two upstreams: ban(terminate connection immediately), echo. For detailed configuration, check [this example](./example-config.yaml).
 
-注意：[::]会默认同时绑定IPv4和IPv6。
+## Performance Benchmark
 
-## 性能测试
+Tested on 4C2G server:
 
-在4C2G的服务器上测试：
+Use fourth to proxy to Nginx(QPS of direct connection: ~120000): ~70000 req/s (Command: `wrk -t200 -c1000 -d120s --latency http://proxy-server:8081`)
 
-使用Fourth代理到Nginx（直连QPS 120000）: ~70000req/s （测试命令：`wrk -t200 -c1000 -d120s --latency http://proxy-server:8081 `）
+Use fourth to proxy to local iperf3: 8Gbps
 
-使用Fourth代理到本地iperf3：8Gbps
-
-## io_uring?
-
-尽管经过了很多尝试，我们发现目前一些Rust下面的io_uring实现存在问题，我们使用的io_uring库实现尽管在吞吐量上可以做到单线程20Gbps（相比之下Tokio仅有8Gbps），但在QPS上存在性能损失较大的问题。因此在有成熟的io_uring实现之前，我们仍然选择epoll。之后我们会持续关注相关进展。
-
-可能以后会为Linux高内核版本的用户提供可选的io_uring加速。
-
-## 感谢
+## Thanks
 
 - [tokio_kcp](https://github.com/Matrix-Zhang/tokio_kcp)
 
-## 协议
+## License
 
-Fourth以Apache-2.0协议开源。
+Fourth is available under terms of Apache-2.0.
\ No newline at end of file
diff --git a/config.yaml.example b/config.yaml.example
new file mode 100644
index 0000000..faffa85
--- /dev/null
+++ b/config.yaml.example
@@ -0,0 +1,16 @@
+version: 1
+log: debug
+
+servers:
+  example_server:
+    listen:
+      - "0.0.0.0:8443"
+    tls: true # Enable TLS features like SNI filtering
+    sni:
+      api.example.org: example-api
+      www.example.org: gh-proxy
+    default: ban
+
+upstream:
+  proxy: "tcp://new-www.example.org:443" # Connect over IPv4 or IPv6 to new-www.example.org:443
+  example-api: "tcp6://api-v1.example.com:443" # Connect over IPv6 to api-v1.example.com:443
diff --git a/src/config.rs b/src/config.rs
index 3fb3252..64c7699 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,3 +1,4 @@
+use crate::servers::upstream_address::UpstreamAddress;
 use log::{debug, warn};
 use serde::Deserialize;
 use std::collections::{HashMap, HashSet};
@@ -6,8 +7,6 @@ use std::io::{Error as IOError, Read};
 use std::net::SocketAddr;
 use tokio::sync::Mutex;
 use url::Url;
-use tokio::time::Instant;
-use time::OffsetDateTime;
 
 #[derive(Debug, Clone)]
 pub struct Config {
@@ -47,7 +46,7 @@ pub enum Upstream {
 }
 
 #[derive(Debug)]
-struct Addr(Mutex<Vec<SocketAddr>>);
+struct Addr(Mutex<UpstreamAddress>);
 
 impl Default for Addr {
     fn default() -> Self {
@@ -71,38 +70,9 @@ pub struct CustomUpstream {
 }
 
 impl CustomUpstream {
-    pub async fn resolve_addresses(&self) -> std::io::Result<()> {
-        {
-            let addr = self.addresses.0.lock().await;
-            if addr.len() > 0 {
-                debug!("Already have addresses: {:?}", &addr);
-                return Ok(());
-            }
-        }
-
-        debug!("Resolving addresses for {}", &self.addr);
-        let addresses = tokio::net::lookup_host(self.addr.clone()).await?;
-
-        let mut addr: Vec<SocketAddr> = match self.protocol.as_ref() {
-            "tcp4" => addresses.into_iter().filter(|a| a.is_ipv4()).collect(),
-            "tcp6" => addresses.into_iter().filter(|a| a.is_ipv6()).collect(),
-            _ => addresses.collect(),
-        };
-
-        debug!("Got addresses for {}: {:?}", &self.addr, &addr);
-        debug!("Resolved at {}", OffsetDateTime::now_utc().format(&time::format_description::well_known::Rfc3339).expect("Format"));
-
-        {
-            let mut self_addr = self.addresses.0.lock().await;
-            self_addr.clear();
-            self_addr.append(&mut addr);
-        }
-        Ok(())
-    }
-
-    pub async fn get_addresses(&self) -> Vec<SocketAddr> {
-        let a = self.addresses.0.lock().await;
-        a.clone()
+    pub async fn resolve_addresses(&self) -> std::io::Result<Vec<SocketAddr>> {
+        let mut addr = self.addresses.0.lock().await;
+        addr.resolve((*self.protocol).into()).await
     }
 }
 
diff --git a/src/servers/mod.rs b/src/servers/mod.rs
index ea54ef8..bda4e79 100644
--- a/src/servers/mod.rs
+++ b/src/servers/mod.rs
@@ -5,23 +5,25 @@ use std::sync::Arc;
 use tokio::task::JoinHandle;
 
 mod protocol;
+pub(crate) mod upstream_address;
+
 use crate::config::{ParsedConfig, Upstream};
 use protocol::tcp;
 
 #[derive(Debug)]
-pub struct Server {
+pub(crate) struct Server {
     pub proxies: Vec<Arc<Proxy>>,
     pub config: ParsedConfig,
 }
 
 #[derive(Debug, Clone)]
-pub struct Proxy {
+pub(crate) struct Proxy {
     pub name: String,
     pub listen: SocketAddr,
     pub protocol: String,
     pub tls: bool,
     pub sni: Option<HashMap<String, String>>,
-    pub default: String,
+    pub default_action: String,
     pub upstream: HashMap<String, Upstream>,
 }
 
@@ -60,7 +62,7 @@ impl Server {
                     protocol: protocol.clone(),
                     tls,
                     sni: sni.clone(),
-                    default: default.clone(),
+                    default_action: default.clone(),
                     upstream: upstream.clone(),
                 };
                 new_server.proxies.push(Arc::new(proxy));
diff --git a/src/servers/protocol/tcp.rs b/src/servers/protocol/tcp.rs
index c415d29..f33a7f8 100644
--- a/src/servers/protocol/tcp.rs
+++ b/src/servers/protocol/tcp.rs
@@ -8,7 +8,7 @@ use tokio::io;
 use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt};
 use tokio::net::{TcpListener, TcpStream};
 
-pub async fn proxy(config: Arc<Proxy>) -> Result<(), Box<dyn std::error::Error>> {
+pub(crate) async fn proxy(config: Arc<Proxy>) -> Result<(), Box<dyn std::error::Error>> {
     let listener = TcpListener::bind(config.listen).await?;
     let config = config.clone();
 
@@ -37,17 +37,17 @@ async fn accept(inbound: TcpStream, proxy: Arc<Proxy>) -> Result<(), Box<dyn std
     info!("New connection from {:?}", inbound.peer_addr()?);
 
     let upstream_name = match proxy.tls {
-        false => proxy.default.clone(),
+        false => proxy.default_action.clone(),
         true => {
             let mut hello_buf = [0u8; 1024];
             inbound.peek(&mut hello_buf).await?;
             let snis = get_sni(&hello_buf);
             if snis.is_empty() {
-                proxy.default.clone()
+                proxy.default_action.clone()
             } else {
                 match proxy.sni.clone() {
                     Some(sni_map) => {
-                        let mut upstream = proxy.default.clone();
+                        let mut upstream = proxy.default_action.clone();
                         for sni in snis {
                             let m = sni_map.get(&sni);
                             if m.is_some() {
@@ -57,7 +57,7 @@ async fn accept(inbound: TcpStream, proxy: Arc<Proxy>) -> Result<(), Box<dyn std
                         }
                         upstream
                     }
-                    None => proxy.default.clone(),
+                    None => proxy.default_action.clone(),
                 }
             }
         }
@@ -70,18 +70,17 @@ async fn accept(inbound: TcpStream, proxy: Arc<Proxy>) -> Result<(), Box<dyn std
         None => {
             warn!(
                 "No upstream named {:?} on server {:?}",
-                proxy.default, proxy.name
+                proxy.default_action, proxy.name
             );
-            return process(inbound, proxy.upstream.get(&proxy.default).unwrap().clone()).await;
+            return process(
+                inbound,
+                proxy.upstream.get(&proxy.default_action).unwrap().clone(),
+            )
+            .await;
             // ToDo: Remove unwrap and check default option
         }
     };
 
-    match upstream {
-        Upstream::Custom(u) => u.resolve_addresses().await?,
-        _ => {}
-    }
-
     return process(inbound, upstream.clone()).await;
 }
 
@@ -100,10 +99,9 @@ async fn process(
             debug!("Bytes read: {:?}", bytes_tx);
         }
         Upstream::Custom(custom) => {
-            custom.resolve_addresses().await?;
             let outbound = match custom.protocol.as_ref() {
                 "tcp4" | "tcp6" | "tcp" => {
-                    TcpStream::connect(custom.get_addresses().await.as_slice()).await?
+                    TcpStream::connect(custom.resolve_addresses().await?.as_slice()).await?
                 }
                 _ => {
                     error!("Reached unknown protocol: {:?}", custom.protocol);
diff --git a/src/servers/upstream_address.rs b/src/servers/upstream_address.rs
new file mode 100644
index 0000000..3220a12
--- /dev/null
+++ b/src/servers/upstream_address.rs
@@ -0,0 +1,115 @@
+use log::debug;
+use std::fmt::{Display, Formatter};
+use std::io::Result;
+use std::net::SocketAddr;
+use time::{Duration, Instant, OffsetDateTime};
+
+#[derive(Debug, Clone, Default)]
+pub(crate) struct UpstreamAddress {
+    address: String,
+    resolved_addresses: Vec<SocketAddr>,
+    resolved_time: Option<Instant>,
+    ttl: Option<Duration>,
+}
+
+impl Display for UpstreamAddress {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        self.address.fmt(f)
+    }
+}
+
+impl UpstreamAddress {
+    pub fn is_valid(&self) -> bool {
+        if let Some(resolved) = self.resolved_time {
+            if let Some(ttl) = self.ttl {
+                return resolved.elapsed() < ttl;
+            }
+        }
+
+        false
+    }
+
+    fn is_resolved(&self) -> bool {
+        self.resolved_addresses.len() > 0
+    }
+
+    fn time_remaining(&self) -> Duration {
+        if !self.is_valid() {
+            return Duration::seconds(0);
+        }
+
+        self.ttl.unwrap() - self.resolved_time.unwrap().elapsed()
+    }
+
+    pub async fn resolve(&mut self, mode: ResolutionMode) -> Result<Vec<SocketAddr>> {
+        if self.is_resolved() && self.is_valid() {
+            debug!(
+                "Already got address {:?}, still valid for {}",
+                &self.resolved_addresses,
+                self.time_remaining()
+            );
+            return Ok(self.resolved_addresses.clone());
+        }
+
+        debug!("Resolving addresses for {}", &self.address);
+
+        let lookup_result = tokio::net::lookup_host(&self.address).await;
+
+        let resolved_addresses = match lookup_result {
+            Ok(resolved_addresses) => resolved_addresses,
+            Err(e) => {
+                // Protect against DNS flooding. Cache the result for 1 second.
+                self.resolved_time = Some(Instant::now());
+                self.ttl = Some(Duration::seconds(3));
+                return Err(e);
+            }
+        };
+
+        let addresses: Vec<SocketAddr> = match mode {
+            ResolutionMode::Ipv4 => resolved_addresses
+                .into_iter()
+                .filter(|a| a.is_ipv4())
+                .collect(),
+
+            ResolutionMode::Ipv6 => resolved_addresses
+                .into_iter()
+                .filter(|a| a.is_ipv6())
+                .collect(),
+
+            _ => resolved_addresses.collect(),
+        };
+
+        debug!("Got addresses for {}: {:?}", &self.address, &addresses);
+        debug!(
+            "Resolved at {}",
+            OffsetDateTime::now_utc()
+                .format(&time::format_description::well_known::Rfc3339)
+                .expect("Format")
+        );
+
+        self.resolved_addresses = addresses;
+        self.resolved_time = Some(Instant::now());
+        self.ttl = Some(Duration::minutes(1));
+
+        Ok(self.resolved_addresses.clone())
+    }
+}
+
+#[derive(Debug, Default, Clone)]
+pub(crate) enum ResolutionMode {
+    #[default]
+    Ipv4AndIpv6,
+    Ipv4,
+    Ipv6,
+}
+
+impl From<&str> for ResolutionMode {
+    fn from(value: &str) -> Self {
+        match value {
+            "tcp4" => ResolutionMode::Ipv4,
+            "tcp6" => ResolutionMode::Ipv6,
+            "tcp" => ResolutionMode::Ipv4AndIpv6,
+            _ => panic!("This should never happen. Please check configuration parser."),
+        }
+    }
+}