diff --git a/.github/actions/nss/action.yml b/.github/actions/nss/action.yml
index 1bca72d3d2..69f1737d42 100644
--- a/.github/actions/nss/action.yml
+++ b/.github/actions/nss/action.yml
@@ -87,14 +87,14 @@ runs:
 
     - name: Checkout NSS
       if: env.USE_SYSTEM_NSS == '0'
-      uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         repository: nss-dev/nss
         path: nss
 
     - name: Checkout NSPR
       if: env.USE_SYSTEM_NSS == '0'
-      uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         repository: nss-dev/nspr
         path: nspr
@@ -111,7 +111,7 @@ runs:
     - name: Cache NSS
       id: cache
       if: env.USE_SYSTEM_NSS == '0' && runner.environment == 'github-hosted'
-      uses: actions/cache@3624ceb22c1c5a301c8db4169662070a689d9ea8 # v4.1.1
+      uses: actions/cache@6849a6489940f00c2f30c0fb92c6274307ccb58a # v4.1.2
       with:
         path: dist
         key: nss-${{ runner.os }}-${{ inputs.type }}-${{ env.NSS_HEAD }}-${{ env.NSPR_HEAD }}
diff --git a/.github/actions/quic-interop-runner/action.yml b/.github/actions/quic-interop-runner/action.yml
index 490ccd152e..c7f31e37a2 100644
--- a/.github/actions/quic-interop-runner/action.yml
+++ b/.github/actions/quic-interop-runner/action.yml
@@ -24,7 +24,7 @@ runs:
   using: "composite"
   steps:
     - name: Checkout quic-interop/quic-interop-runner repository
-      uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         repository: 'quic-interop/quic-interop-runner'
         path: 'quic-interop-runner'
diff --git a/.github/workflows/actionlint.yml b/.github/workflows/actionlint.yml
index f23e252ca5..83d6dfe97e 100644
--- a/.github/workflows/actionlint.yml
+++ b/.github/workflows/actionlint.yml
@@ -22,7 +22,7 @@ jobs:
       run:
         shell: bash
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Download actionlint
         id: get_actionlint
         run: bash <(curl https://raw.githubusercontent.com/rhysd/actionlint/main/scripts/download-actionlint.bash)
diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml
index b2e7740cd0..e6173a8475 100644
--- a/.github/workflows/bench.yml
+++ b/.github/workflows/bench.yml
@@ -27,10 +27,10 @@ jobs:
 
     steps:
       - name: Checkout neqo
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Checkout msquic
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           repository: microsoft/msquic
           ref: main
@@ -70,7 +70,7 @@ jobs:
 
       - name: Download cached main-branch results
         id: criterion-cache
-        uses: actions/cache/restore@3624ceb22c1c5a301c8db4169662070a689d9ea8 # v4.1.1
+        uses: actions/cache/restore@6849a6489940f00c2f30c0fb92c6274307ccb58a # v4.1.2
         with:
           path: ./target/criterion
           key: criterion-${{ runner.name }}-${{ github.sha }}
@@ -240,7 +240,7 @@ jobs:
 
       - name: Cache main-branch results
         if: github.ref == 'refs/heads/main'
-        uses: actions/cache/save@3624ceb22c1c5a301c8db4169662070a689d9ea8 # v4.1.1
+        uses: actions/cache/save@6849a6489940f00c2f30c0fb92c6274307ccb58a # v4.1.2
         with:
           path: ./target/criterion
           key: criterion-${{ runner.name }}-${{ github.sha }}
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index d9179bc35e..0d840b3e06 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -35,7 +35,7 @@ jobs:
     outputs:
       toolchains: ${{ steps.toolchains.outputs.toolchains }}
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           sparse-checkout: Cargo.toml
       - id: toolchains
@@ -60,7 +60,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - uses: ./.github/actions/rust
         with:
diff --git a/.github/workflows/clippy.yml b/.github/workflows/clippy.yml
index 6bd7e3ccb3..84eaded3f7 100644
--- a/.github/workflows/clippy.yml
+++ b/.github/workflows/clippy.yml
@@ -31,7 +31,7 @@ jobs:
         shell: bash
 
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: ./.github/actions/rust
         with:
           components: clippy
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index 38bb2dad1e..3b423b2bc2 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -24,8 +24,8 @@ jobs:
   dependency-review:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
-      - uses: actions/dependency-review-action@5a2ce3f5b92ee19cbb1541a4984c76d921601d7c # v4.3.4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/dependency-review-action@4081bf99e2866ebe428fc0477b69eb4fcda7220a # v4.4.0
         with:
           base-ref: ${{ github.event.pull_request.base.sha || 'main' }}
           head-ref: ${{ github.event.pull_request.head.sha || github.ref }}
diff --git a/.github/workflows/firefox.yml b/.github/workflows/firefox.yml
index 90cc485b93..658d9d638a 100644
--- a/.github/workflows/firefox.yml
+++ b/.github/workflows/firefox.yml
@@ -35,7 +35,7 @@ jobs:
 
     steps:
       - name: Check out Neqo
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Maximize build space
         if: runner.os == 'Linux'
@@ -54,7 +54,7 @@ jobs:
           df -h
 
       - name: Check out Firefox
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           repository: mozilla/gecko-dev
           path: mozilla-unified
@@ -144,7 +144,7 @@ jobs:
     needs: firefox
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
         with:
diff --git a/.github/workflows/fuzz-bench.yml b/.github/workflows/fuzz-bench.yml
index 0749035b0f..8ef9323207 100644
--- a/.github/workflows/fuzz-bench.yml
+++ b/.github/workflows/fuzz-bench.yml
@@ -20,7 +20,7 @@ jobs:
   fuzz-bench:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: ./.github/actions/rust
         with:
           version: nightly
diff --git a/.github/workflows/machete.yml b/.github/workflows/machete.yml
index f72d9215e6..b1f5c82333 100644
--- a/.github/workflows/machete.yml
+++ b/.github/workflows/machete.yml
@@ -20,7 +20,7 @@ jobs:
   machete:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Install Rust
         uses: ./.github/actions/rust
diff --git a/.github/workflows/mutants.yml b/.github/workflows/mutants.yml
index bd318c1b75..fcd52f8b9e 100644
--- a/.github/workflows/mutants.yml
+++ b/.github/workflows/mutants.yml
@@ -20,7 +20,7 @@ jobs:
     if: github.event_name == 'pull_request' || github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/pr-comment.yml b/.github/workflows/pr-comment.yml
index 0ce5da9dc4..e0ae87e9a8 100644
--- a/.github/workflows/pr-comment.yml
+++ b/.github/workflows/pr-comment.yml
@@ -24,7 +24,7 @@ jobs:
       github.event.workflow_run.event == 'pull_request' &&
       (github.event.workflow_run.conclusion == 'success' || github.event.workflow_run.conclusion == 'failure')
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: ./.github/actions/pr-comment
         with:
           name: ${{ github.event.workflow_run.name }}
diff --git a/.github/workflows/qns.yml b/.github/workflows/qns.yml
index 294382bea8..ee928cc12f 100644
--- a/.github/workflows/qns.yml
+++ b/.github/workflows/qns.yml
@@ -142,7 +142,7 @@ jobs:
           echo "client=$(echo "$PAIR" | cut -d% -f1)" >> "$GITHUB_OUTPUT"
           echo "server=$(echo "$PAIR" | cut -d% -f2)" >> "$GITHUB_OUTPUT"
 
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       # TODO: Replace once https://github.com/quic-interop/quic-interop-runner/pull/356 is merged.
       - uses: ./.github/actions/quic-interop-runner
@@ -158,7 +158,7 @@ jobs:
     runs-on: ubuntu-latest
     if: always()
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
         with:
           pattern: '*results'
diff --git a/.github/workflows/rustfmt.yml b/.github/workflows/rustfmt.yml
index fd7710fea6..9c2147d54c 100644
--- a/.github/workflows/rustfmt.yml
+++ b/.github/workflows/rustfmt.yml
@@ -23,7 +23,7 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: ./.github/actions/rust
         with:
           version: nightly
diff --git a/.github/workflows/sanitize.yml b/.github/workflows/sanitize.yml
index 2862a221e5..b49ec3ac7d 100644
--- a/.github/workflows/sanitize.yml
+++ b/.github/workflows/sanitize.yml
@@ -40,7 +40,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: ./.github/actions/rust
         with:
           version: nightly
diff --git a/Cargo.toml b/Cargo.toml
index 1c9de115fa..8d3c8726d1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,7 +31,7 @@ rust-version = "1.76.0"
 [workspace.dependencies]
 log = { version = "0.4", default-features = false }
 qlog = { version = "0.13", default-features = false }
-quinn-udp = { version = "0.5.4", default-features = false, features = ["direct-log"] }
+quinn-udp = { version = "0.5.6", default-features = false, features = ["direct-log"] }
 
 [workspace.lints.clippy]
 cargo = { level = "warn", priority = -1 }
diff --git a/neqo-bin/src/client/http3.rs b/neqo-bin/src/client/http3.rs
index 6ce41bef7c..b847f9a5f4 100644
--- a/neqo-bin/src/client/http3.rs
+++ b/neqo-bin/src/client/http3.rs
@@ -28,7 +28,7 @@ use neqo_transport::{
 use url::Url;
 
 use super::{get_output_file, qlog_new, Args, CloseState, Res};
-use crate::STREAM_IO_BUFFER_SIZE;
+use crate::{send_data::SendData, STREAM_IO_BUFFER_SIZE};
 
 pub struct Handler<'a> {
     #[allow(clippy::struct_field_names)]
@@ -312,9 +312,7 @@ impl StreamHandler for DownloadStreamHandler {
 }
 
 struct UploadStreamHandler {
-    data: Vec<u8>,
-    offset: usize,
-    chunk_size: usize,
+    data: SendData,
     start: Instant,
 }
 
@@ -344,21 +342,11 @@ impl StreamHandler for UploadStreamHandler {
     }
 
     fn process_data_writable(&mut self, client: &mut Http3Client, stream_id: StreamId) {
-        while self.offset < self.data.len() {
-            let end = self.offset + self.chunk_size.min(self.data.len() - self.offset);
-            let chunk = &self.data[self.offset..end];
-            match client.send_data(stream_id, chunk) {
-                Ok(amount) => {
-                    if amount == 0 {
-                        break;
-                    }
-                    self.offset += amount;
-                    if self.offset == self.data.len() {
-                        client.stream_close_send(stream_id).unwrap();
-                    }
-                }
-                Err(_) => break,
-            };
+        let done = self
+            .data
+            .send(|chunk| client.send_data(stream_id, chunk).unwrap());
+        if done {
+            client.stream_close_send(stream_id).unwrap();
         }
     }
 }
@@ -416,9 +404,7 @@ impl UrlHandler<'_> {
                         Box::new(DownloadStreamHandler { out_file })
                     }
                     "POST" => Box::new(UploadStreamHandler {
-                        data: vec![42; self.args.upload_size],
-                        offset: 0,
-                        chunk_size: STREAM_IO_BUFFER_SIZE,
+                        data: SendData::zeroes(self.args.upload_size),
                         start: Instant::now(),
                     }),
                     _ => unimplemented!(),
diff --git a/neqo-bin/src/lib.rs b/neqo-bin/src/lib.rs
index a439183a74..f151f2642e 100644
--- a/neqo-bin/src/lib.rs
+++ b/neqo-bin/src/lib.rs
@@ -21,6 +21,7 @@ use neqo_transport::{
 };
 
 pub mod client;
+mod send_data;
 pub mod server;
 pub mod udp;
 
diff --git a/neqo-bin/src/send_data.rs b/neqo-bin/src/send_data.rs
new file mode 100644
index 0000000000..5634d4c5c8
--- /dev/null
+++ b/neqo-bin/src/send_data.rs
@@ -0,0 +1,78 @@
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::{borrow::Cow, cmp::min};
+
+use crate::STREAM_IO_BUFFER_SIZE;
+
+#[derive(Debug)]
+pub struct SendData {
+    data: Cow<'static, [u8]>,
+    offset: usize,
+    remaining: usize,
+    total: usize,
+}
+
+impl From<&[u8]> for SendData {
+    fn from(data: &[u8]) -> Self {
+        Self::from(data.to_vec())
+    }
+}
+
+impl From<Vec<u8>> for SendData {
+    fn from(data: Vec<u8>) -> Self {
+        let remaining = data.len();
+        Self {
+            total: data.len(),
+            data: Cow::Owned(data),
+            offset: 0,
+            remaining,
+        }
+    }
+}
+
+impl From<&str> for SendData {
+    fn from(data: &str) -> Self {
+        Self::from(data.as_bytes())
+    }
+}
+
+impl SendData {
+    pub const fn zeroes(total: usize) -> Self {
+        const MESSAGE: &[u8] = &[0; STREAM_IO_BUFFER_SIZE];
+        Self {
+            data: Cow::Borrowed(MESSAGE),
+            offset: 0,
+            remaining: total,
+            total,
+        }
+    }
+
+    fn slice(&self) -> &[u8] {
+        let end = min(self.data.len(), self.offset + self.remaining);
+        &self.data[self.offset..end]
+    }
+
+    pub fn send(&mut self, mut f: impl FnMut(&[u8]) -> usize) -> bool {
+        while self.remaining > 0 {
+            match f(self.slice()) {
+                0 => {
+                    return false;
+                }
+                sent => {
+                    self.remaining -= sent;
+                    self.offset = (self.offset + sent) % self.data.len();
+                }
+            }
+        }
+
+        self.remaining == 0
+    }
+
+    pub const fn len(&self) -> usize {
+        self.total
+    }
+}
diff --git a/neqo-bin/src/server/http09.rs b/neqo-bin/src/server/http09.rs
index 1815140b01..1887e3ac6f 100644
--- a/neqo-bin/src/server/http09.rs
+++ b/neqo-bin/src/server/http09.rs
@@ -15,13 +15,13 @@ use neqo_transport::{
 };
 use regex::Regex;
 
-use super::{qns_read_response, Args, ResponseData};
-use crate::STREAM_IO_BUFFER_SIZE;
+use super::{qns_read_response, Args};
+use crate::{send_data::SendData, STREAM_IO_BUFFER_SIZE};
 
 #[derive(Default)]
 struct HttpStreamState {
     writable: bool,
-    data_to_send: Option<ResponseData>,
+    data_to_send: Option<SendData>,
 }
 
 pub struct HttpServer {
@@ -127,7 +127,7 @@ impl HttpServer {
             return;
         };
 
-        let resp: ResponseData = {
+        let resp: SendData = {
             let path = path.as_str();
             qdebug!("Path = '{path}'");
             if self.is_qns_test {
@@ -140,7 +140,7 @@ impl HttpServer {
                 }
             } else {
                 let count = path.parse().unwrap();
-                ResponseData::zeroes(count)
+                SendData::zeroes(count)
             }
         };
 
@@ -173,8 +173,8 @@ impl HttpServer {
 
         stream_state.writable = true;
         if let Some(resp) = &mut stream_state.data_to_send {
-            resp.send_h09(stream_id, conn);
-            if resp.done() {
+            let done = resp.send(|chunk| conn.borrow_mut().stream_send(stream_id, chunk).unwrap());
+            if done {
                 conn.borrow_mut().stream_close_send(stream_id).unwrap();
                 self.write_state.remove(&stream_id);
             } else {
diff --git a/neqo-bin/src/server/http3.rs b/neqo-bin/src/server/http3.rs
index 3506387a62..dfef3f1be4 100644
--- a/neqo-bin/src/server/http3.rs
+++ b/neqo-bin/src/server/http3.rs
@@ -19,12 +19,13 @@ use neqo_http3::{
 };
 use neqo_transport::{server::ValidateAddress, ConnectionIdGenerator};
 
-use super::{qns_read_response, Args, ResponseData};
+use super::{qns_read_response, Args};
+use crate::send_data::SendData;
 
 pub struct HttpServer {
     server: Http3Server,
     /// Progress writing to each stream.
-    remaining_data: HashMap<StreamId, ResponseData>,
+    remaining_data: HashMap<StreamId, SendData>,
     posts: HashMap<Http3OrWebTransportStream, usize>,
     is_qns_test: bool,
 }
@@ -110,7 +111,7 @@ impl super::HttpServer for HttpServer {
 
                     let mut response = if self.is_qns_test {
                         match qns_read_response(path.value()) {
-                            Ok(data) => ResponseData::from(data),
+                            Ok(data) => SendData::from(data),
                             Err(e) => {
                                 qerror!("Failed to read {}: {e}", path.value());
                                 stream
@@ -123,19 +124,19 @@ impl super::HttpServer for HttpServer {
                     } else if let Ok(count) =
                         path.value().trim_matches(|p| p == '/').parse::<usize>()
                     {
-                        ResponseData::zeroes(count)
+                        SendData::zeroes(count)
                     } else {
-                        ResponseData::from(path.value())
+                        SendData::from(path.value())
                     };
 
                     stream
                         .send_headers(&[
                             Header::new(":status", "200"),
-                            Header::new("content-length", response.remaining.to_string()),
+                            Header::new("content-length", response.len().to_string()),
                         ])
                         .unwrap();
-                    response.send_h3(&stream);
-                    if response.done() {
+                    let done = response.send(|chunk| stream.send_data(chunk).unwrap());
+                    if done {
                         stream.stream_close_send().unwrap();
                     } else {
                         self.remaining_data.insert(stream.stream_id(), response);
@@ -144,8 +145,8 @@ impl super::HttpServer for HttpServer {
                 Http3ServerEvent::DataWritable { stream } => {
                     if self.posts.get_mut(&stream).is_none() {
                         if let Some(remaining) = self.remaining_data.get_mut(&stream.stream_id()) {
-                            remaining.send_h3(&stream);
-                            if remaining.done() {
+                            let done = remaining.send(|chunk| stream.send_data(chunk).unwrap());
+                            if done {
                                 self.remaining_data.remove(&stream.stream_id());
                                 stream.stream_close_send().unwrap();
                             }
diff --git a/neqo-bin/src/server/mod.rs b/neqo-bin/src/server/mod.rs
index 27e7ab3d95..8927890e8e 100644
--- a/neqo-bin/src/server/mod.rs
+++ b/neqo-bin/src/server/mod.rs
@@ -7,9 +7,7 @@
 #![allow(clippy::future_not_send)]
 
 use std::{
-    borrow::Cow,
     cell::RefCell,
-    cmp::min,
     fmt::{self, Display},
     fs, io,
     net::{SocketAddr, ToSocketAddrs},
@@ -30,11 +28,10 @@ use neqo_crypto::{
     constants::{TLS_AES_128_GCM_SHA256, TLS_AES_256_GCM_SHA384, TLS_CHACHA20_POLY1305_SHA256},
     init_db, AntiReplay, Cipher,
 };
-use neqo_http3::{Http3OrWebTransportStream, StreamId};
-use neqo_transport::{server::ConnectionRef, Output, RandomConnectionIdGenerator, Version};
+use neqo_transport::{Output, RandomConnectionIdGenerator, Version};
 use tokio::time::Sleep;
 
-use crate::{SharedArgs, STREAM_IO_BUFFER_SIZE};
+use crate::SharedArgs;
 
 const ANTI_REPLAY_WINDOW: Duration = Duration::from_secs(10);
 
@@ -409,89 +406,3 @@ pub async fn server(mut args: Args) -> Res<()> {
         .run()
         .await
 }
-
-#[derive(Debug)]
-struct ResponseData {
-    data: Cow<'static, [u8]>,
-    offset: usize,
-    remaining: usize,
-}
-
-impl From<&[u8]> for ResponseData {
-    fn from(data: &[u8]) -> Self {
-        Self::from(data.to_vec())
-    }
-}
-
-impl From<Vec<u8>> for ResponseData {
-    fn from(data: Vec<u8>) -> Self {
-        let remaining = data.len();
-        Self {
-            data: Cow::Owned(data),
-            offset: 0,
-            remaining,
-        }
-    }
-}
-
-impl From<&str> for ResponseData {
-    fn from(data: &str) -> Self {
-        Self::from(data.as_bytes())
-    }
-}
-
-impl ResponseData {
-    const fn zeroes(total: usize) -> Self {
-        const MESSAGE: &[u8] = &[0; STREAM_IO_BUFFER_SIZE];
-        Self {
-            data: Cow::Borrowed(MESSAGE),
-            offset: 0,
-            remaining: total,
-        }
-    }
-
-    fn slice(&self) -> &[u8] {
-        let end = min(self.data.len(), self.offset + self.remaining);
-        &self.data[self.offset..end]
-    }
-
-    fn send_h3(&mut self, stream: &Http3OrWebTransportStream) {
-        while self.remaining > 0 {
-            match stream.send_data(self.slice()) {
-                Ok(0) => {
-                    return;
-                }
-                Ok(sent) => {
-                    self.remaining -= sent;
-                    self.offset = (self.offset + sent) % self.data.len();
-                }
-                Err(e) => {
-                    qwarn!("Error writing to stream {}: {:?}", stream, e);
-                    return;
-                }
-            }
-        }
-    }
-
-    fn send_h09(&mut self, stream_id: StreamId, conn: &ConnectionRef) {
-        while self.remaining > 0 {
-            match conn
-                .borrow_mut()
-                .stream_send(stream_id, self.slice())
-                .unwrap()
-            {
-                0 => {
-                    return;
-                }
-                sent => {
-                    self.remaining -= sent;
-                    self.offset = (self.offset + sent) % self.data.len();
-                }
-            }
-        }
-    }
-
-    const fn done(&self) -> bool {
-        self.remaining == 0
-    }
-}
diff --git a/qns/Dockerfile b/qns/Dockerfile
index e13ac76027..c93406890f 100644
--- a/qns/Dockerfile
+++ b/qns/Dockerfile
@@ -1,4 +1,4 @@
-FROM lukemathwalker/cargo-chef@sha256:3bf32e02df18ed868a19bcf6e937f99ca155cce42e45140737113526efd33c5f AS chef
+FROM lukemathwalker/cargo-chef@sha256:49338f8970645f531cbef198e3929910f1dbf17491d73289ab838d5ac7ae3511 AS chef
 
 WORKDIR /app