avoid inserting extraneous"accept-encoding" header (#5057)

* add no extraneous accept-encoding header test

* ensure fetch honors no decompress opt

* fix format on test/js/node/http/node-http.test.ts

2 files changed, 22 insertions, 1 deletions

diff --git a/src/http_client_async.zig b/src/http_client_async.zig
index f06474219..79fe74899 100644
--- a/src/http_client_async.zig
+++ b/src/http_client_async.zig
@@ -2122,7 +2122,7 @@ pub fn buildRequest(this: *HTTPClient, body_len: usize) picohttp.Request {
         header_count += 1;
     }
 
-    if (!override_accept_encoding) {
+    if (!override_accept_encoding and !this.disable_decompression) {
         request_headers_buf[header_count] = accept_encoding_header;
         header_count += 1;
     }
diff --git a/test/js/node/http/node-http.test.ts b/test/js/node/http/node-http.test.ts
index f80a6c631..b8302c1d8 100644
--- a/test/js/node/http/node-http.test.ts
+++ b/test/js/node/http/node-http.test.ts
@@ -241,6 +241,27 @@ describe("node:http", () => {
     //   });
     // });
 
+    it("should not insert extraneous accept-encoding header", async done => {
+      try {
+        let headers;
+        var server = createServer((req, res) => {
+          headers = req.headers;
+          req.on("data", () => {});
+          req.on("end", () => {
+            res.end();
+          });
+        });
+        const url = await listen(server);
+        await fetch(url, { decompress: false });
+        expect(headers["accept-encoding"]).toBeFalsy();
+        done();
+      } catch (e) {
+        done(e);
+      } finally {
+        server.close();
+      }
+    });
+
     it("should make a standard GET request when passed string as first arg", done => {
       runTest(done, (server, port, done) => {
         const req = request(`http://localhost:${port}`, res => {