Increase HTTP/2 response header limit

Set Yaak's reqwest request clients to accept HTTP/2 response header lists up to 1 MiB and wrap configured clients so the sender path cannot accidentally bypass the shared builder.

Feedback: https://yaak.app/feedback/posts/when-response-headers-exceed-a-certain-size-hyper-throws-error

crates/yaak-http/src/client.rs

@@ -1,11 +1,36 @@
 use crate::dns::LocalhostResolver;
 use crate::error::Result;
 use log::{debug, info, warn};
-use reqwest::{Client, Proxy, redirect};
+use reqwest::{Client, ClientBuilder, Proxy, redirect};
 use std::sync::Arc;
 use yaak_models::models::DnsOverride;
 use yaak_tls::{ClientCertificateConfig, get_tls_config};
 
+pub const HTTP2_MAX_RESPONSE_HEADER_LIST_SIZE: u32 = 1024 * 1024;
+
+fn client_builder() -> ClientBuilder {
+    Client::builder().http2_max_header_list_size(HTTP2_MAX_RESPONSE_HEADER_LIST_SIZE)
+}
+
+#[derive(Clone)]
+pub struct ConfiguredClient {
+    inner: Client,
+}
+
+impl ConfiguredClient {
+    pub(crate) fn build_default() -> Result<Self> {
+        Ok(Self { inner: client_builder().build()? })
+    }
+
+    pub(crate) fn from_inner(inner: Client) -> Self {
+        Self { inner }
+    }
+
+    pub(crate) fn inner(&self) -> &Client {
+        &self.inner
+    }
+}
+
 #[derive(Clone)]
 pub struct HttpConnectionProxySettingAuth {
     pub user: String,
@@ -37,8 +62,8 @@ impl HttpConnectionOptions {
     /// Build a reqwest Client and return it along with the DNS resolver.
     /// The resolver is returned separately so it can be configured per-request
     /// to emit DNS timing events to the appropriate channel.
-    pub(crate) fn build_client(&self) -> Result<(Client, Arc<LocalhostResolver>)> {
-        let mut client = Client::builder()
+    pub(crate) fn build_client(&self) -> Result<(ConfiguredClient, Arc<LocalhostResolver>)> {
+        let mut client = client_builder()
             .connection_verbose(true)
             .redirect(redirect::Policy::none())
             // Decompression is handled by HttpTransaction, not reqwest
@@ -79,7 +104,7 @@ impl HttpConnectionOptions {
             self.client_certificate.is_some()
         );
 
-        Ok((client.build()?, resolver))
+        Ok((ConfiguredClient::from_inner(client.build()?), resolver))
     }
 }
 

crates/yaak-http/src/manager.rs

@@ -1,7 +1,6 @@
-use crate::client::HttpConnectionOptions;
+use crate::client::{ConfiguredClient, HttpConnectionOptions};
 use crate::dns::LocalhostResolver;
 use crate::error::Result;
-use reqwest::Client;
 use std::collections::BTreeMap;
 use std::sync::Arc;
 use std::time::{Duration, Instant};
@@ -10,7 +9,7 @@ use tokio::sync::RwLock;
 /// A cached HTTP client along with its DNS resolver.
 /// The resolver is needed to set the event sender per-request.
 pub struct CachedClient {
-    pub client: Client,
+    pub client: ConfiguredClient,
     pub resolver: Arc<LocalhostResolver>,
 }
 

crates/yaak-http/src/sender.rs

@@ -5,7 +5,7 @@ use async_trait::async_trait;
 use bytes::Bytes;
 use futures_util::StreamExt;
 use http_body::{Body as HttpBody, Frame, SizeHint};
-use reqwest::{Client, Method, Version};
+use reqwest::{Method, Version};
 use std::fmt::Display;
 use std::pin::Pin;
 use std::task::{Context, Poll};
@@ -411,18 +411,18 @@ pub trait HttpSender: Send + Sync {
 
 /// Reqwest-based implementation of HttpSender
 pub struct ReqwestSender {
-    client: Client,
+    client: crate::client::ConfiguredClient,
 }
 
 impl ReqwestSender {
     /// Create a new ReqwestSender with a default client
     pub fn new() -> Result<Self> {
-        let client = Client::builder().build().map_err(Error::Client)?;
+        let client = crate::client::ConfiguredClient::build_default()?;
         Ok(Self { client })
     }
 
-    /// Create a new ReqwestSender with a custom client
-    pub fn with_client(client: Client) -> Self {
+    /// Create a new ReqwestSender with a configured client
+    pub fn with_client(client: crate::client::ConfiguredClient) -> Self {
         Self { client }
     }
 }
@@ -444,7 +444,7 @@ impl HttpSender for ReqwestSender {
             .map_err(|e| Error::RequestError(format!("Invalid HTTP method: {}", e)))?;
 
         // Build the request
-        let mut req_builder = self.client.request(method, &request.url);
+        let mut req_builder = self.client.inner().request(method, &request.url);
 
         // Add headers
         for header in request.headers {
@@ -513,7 +513,7 @@ impl HttpSender for ReqwestSender {
         send_event(HttpResponseEvent::Info("Sending request to server".to_string()));
 
         // Map some errors to our own, so they look nicer
-        let response = self.client.execute(sendable_req).await.map_err(|e| {
+        let response = self.client.inner().execute(sendable_req).await.map_err(|e| {
             if reqwest::Error::is_timeout(&e) {
                 Error::RequestTimeout(
                     request.options.timeout.unwrap_or(Duration::from_secs(0)).clone(),