feat: Deno.createHttpClient allowHost (#19689)

This adds an option to allow using the host header in a fetch call.
Closes https://github.com/denoland/deno/issues/16840
Ref https://github.com/denoland/deno/issues/11017

1 files changed, 12 insertions, 7 deletions

diff --git a/ext/fetch/lib.rs b/ext/fetch/lib.rs
index a3daff040..48f6a0294 100644
--- a/ext/fetch/lib.rs
+++ b/ext/fetch/lib.rs
@@ -237,11 +237,11 @@ pub fn op_fetch<FP>(
 where
   FP: FetchPermissions + 'static,
 {
-  let client = if let Some(rid) = client_rid {
+  let (client, allow_host) = if let Some(rid) = client_rid {
     let r = state.resource_table.get::<HttpClientResource>(rid)?;
-    r.client.clone()
+    (r.client.clone(), r.allow_host)
   } else {
-    get_or_create_client_from_state(state)?
+    (get_or_create_client_from_state(state)?, false)
   };
 
   let method = Method::from_bytes(&method)?;
@@ -334,7 +334,7 @@ where
         let v = HeaderValue::from_bytes(&value)
           .map_err(|err| type_error(err.to_string()))?;
 
-        if !matches!(name, HOST | CONTENT_LENGTH) {
+        if (name != HOST || allow_host) && name != CONTENT_LENGTH {
           header_map.append(name, v);
         }
       }
@@ -761,6 +761,7 @@ impl Resource for FetchResponseResource {
 
 pub struct HttpClientResource {
   pub client: Client,
+  pub allow_host: bool,
 }
 
 impl Resource for HttpClientResource {
@@ -770,8 +771,8 @@ impl Resource for HttpClientResource {
 }
 
 impl HttpClientResource {
-  fn new(client: Client) -> Self {
-    Self { client }
+  fn new(client: Client, allow_host: bool) -> Self {
+    Self { client, allow_host }
   }
 }
 
@@ -795,6 +796,8 @@ pub struct CreateHttpClientArgs {
   http1: bool,
   #[serde(default = "default_true")]
   http2: bool,
+  #[serde(default)]
+  allow_host: bool,
 }
 
 fn default_true() -> bool {
@@ -860,7 +863,9 @@ where
     },
   )?;
 
-  let rid = state.resource_table.add(HttpClientResource::new(client));
+  let rid = state
+    .resource_table
+    .add(HttpClientResource::new(client, args.allow_host));
   Ok(rid)
 }