Ignore content type parameters when matching it

src/connectrpc/_codec.py

@@ -8,9 +8,6 @@
 
 CODEC_NAME_PROTO = "proto"
 CODEC_NAME_JSON = "json"
-# Follow connect-go's hacky approach to handling charset parameter
-# https://github.com/connectrpc/connect-go/blob/fe4915717d32438c40a24a50e3895271d4c24751/codec.go#L31
-CODEC_NAME_JSON_CHARSET_UTF8 = "json; charset=utf-8"
 
 
 T_contra = TypeVar("T_contra", contravariant=True)
@@ -68,11 +65,7 @@ def decode(self, data: bytes | bytearray, message: V) -> V:
 
 _proto_binary_codec = ProtoBinaryCodec()
 _proto_json_codec = ProtoJSONCodec()
-_default_codecs = [
-    _proto_binary_codec,
-    _proto_json_codec,
-    ProtoJSONCodec(name=CODEC_NAME_JSON_CHARSET_UTF8),
-]
+_default_codecs = [_proto_binary_codec, _proto_json_codec]
 
 
 def get_default_codecs() -> list[Codec]:

src/connectrpc/_protocol_connect.py

@@ -5,7 +5,7 @@
 from http import HTTPStatus
 from typing import TYPE_CHECKING, Any, TypeVar
 
-from ._codec import CODEC_NAME_JSON, CODEC_NAME_JSON_CHARSET_UTF8, Codec
+from ._codec import CODEC_NAME_JSON, Codec
 from ._compression import IdentityCompression, negotiate_compression
 from ._envelope import EnvelopeReader, EnvelopeWriter
 from ._protocol import (
@@ -36,6 +36,9 @@
 CONNECT_PROTOCOL_VERSION = "1"
 CONNECT_HEADER_TIMEOUT = "connect-timeout-ms"
 CONNECT_UNARY_CONTENT_TYPE_PREFIX = "application/"
+CONNECT_UNARY_CONTENT_TYPE_JSON = (
+    f"{CONNECT_UNARY_CONTENT_TYPE_PREFIX}{CODEC_NAME_JSON}"
+)
 CONNECT_STREAMING_CONTENT_TYPE_PREFIX = "application/connect+"
 CONNECT_UNARY_HEADER_COMPRESSION = "content-encoding"
 CONNECT_UNARY_HEADER_ACCEPT_COMPRESSION = "accept-encoding"
@@ -46,7 +49,16 @@
 _DEFAULT_CONNECT_USER_AGENT = f"connectrpc/{__version__}"
 
 
+def _normalize_content_type(content_type: str) -> str:
+    # content-type can have parameters, most commonly charset. Our supported codecs,
+    # binary and JSON are always either non-text or utf-8 and the parameters are not
+    # important for matching to a codec. A custom codec could conceivably need to
+    # match on parameters, but we will reconsider that if it is ever asked for.
+    return content_type.partition(";")[0].strip().lower()
+
+
 def codec_name_from_content_type(content_type: str, *, stream: bool) -> str:
+    content_type = _normalize_content_type(content_type)
     prefix = (
         CONNECT_STREAMING_CONTENT_TYPE_PREFIX
         if stream
@@ -226,12 +238,10 @@ def create_request_context(
     def validate_response(
         self, request_codec_name: str, status_code: int, response_content_type: str
     ) -> None:
+        response_content_type = _normalize_content_type(response_content_type)
         if status_code != HTTPStatus.OK:
             # Error responses must be JSON-encoded
-            if response_content_type in (
-                f"{CONNECT_UNARY_CONTENT_TYPE_PREFIX}{CODEC_NAME_JSON}",
-                f"{CONNECT_UNARY_CONTENT_TYPE_PREFIX}{CODEC_NAME_JSON_CHARSET_UTF8}",
-            ):
+            if response_content_type == CONNECT_UNARY_CONTENT_TYPE_JSON:
                 return
             raise ConnectWireError.from_http_status(status_code).to_exception()
 
@@ -247,16 +257,6 @@ def validate_response(
         if response_codec_name == request_codec_name:
             return
 
-        if (
-            response_codec_name == CODEC_NAME_JSON
-            and request_codec_name == CODEC_NAME_JSON_CHARSET_UTF8
-        ) or (
-            response_codec_name == CODEC_NAME_JSON_CHARSET_UTF8
-            and request_codec_name == CODEC_NAME_JSON
-        ):
-            # Both are JSON
-            return
-
         raise ConnectError(
             Code.INTERNAL,
             f"invalid content-type: '{response_content_type}'; expecting '{CONNECT_UNARY_CONTENT_TYPE_PREFIX}{request_codec_name}'",

src/connectrpc/_server_async.py

@@ -213,7 +213,7 @@ async def __call__(
                 codec_name = protocol.codec_name_from_content_type(
                     headers.get("content-type", ""), stream=not is_unary
                 )
-            codec = self._codecs.get(codec_name.lower())
+            codec = self._codecs.get(codec_name)
             if not codec:
                 raise HTTPException(
                     HTTPStatus.UNSUPPORTED_MEDIA_TYPE,

src/connectrpc/_server_sync.py

@@ -70,13 +70,12 @@
 )
 
 
-def _normalize_wsgi_headers(environ: WSGIEnvironment) -> dict:
-    """Extract and normalize HTTP headers from WSGI environment."""
-    headers = {}
+def _process_headers(environ: WSGIEnvironment) -> Headers:
+    headers = Headers()
     if "CONTENT_TYPE" in environ:
-        headers["content-type"] = environ["CONTENT_TYPE"].lower()
+        headers["content-type"] = environ["CONTENT_TYPE"]
     if "CONTENT_LENGTH" in environ:
-        headers["content-length"] = environ["CONTENT_LENGTH"].lower()
+        headers["content-length"] = environ["CONTENT_LENGTH"]
 
     for key, value in environ.items():
         if key.startswith("HTTP_"):
@@ -85,17 +84,6 @@ def _normalize_wsgi_headers(environ: WSGIEnvironment) -> dict:
     return headers
 
 
-def _process_headers(headers: dict) -> Headers:
-    result = Headers()
-    for key, value in headers.items():
-        if isinstance(value, list | tuple):
-            for v in value:
-                result.add(key, v)
-        else:
-            result.add(key, str(value))
-    return result
-
-
 def prepare_response_headers(
     base_headers: dict[str, list[str]], selected_encoding: str
 ) -> dict[str, list[str]]:
@@ -220,7 +208,7 @@ def __call__(
 
             http_method = environ["REQUEST_METHOD"]
             http_scheme = environ.get("wsgi.url_scheme", "http")
-            headers = _process_headers(_normalize_wsgi_headers(environ))
+            headers = _process_headers(environ)
             if ra := environ.get("REMOTE_ADDR"):
                 port = environ.get("REMOTE_PORT", "0")
                 client_address = f"{ra}:{port}"

test/test_http.py

@@ -0,0 +1,62 @@
+from __future__ import annotations
+
+import pytest
+from pyqwest import Client, SyncClient
+from pyqwest.testing import ASGITransport, WSGITransport
+
+from .haberdasher_connect import (
+    Haberdasher,
+    HaberdasherASGIApplication,
+    HaberdasherSync,
+    HaberdasherWSGIApplication,
+)
+from .haberdasher_pb2 import Hat
+
+_charset_content_type_cases = [
+    "application/json",
+    "application/json; charset=utf-8",
+    "application/json; charset=UTF-8",
+    "application/json;charset=utf-8",
+    "application/json;    charset=utf-8",
+    "application/json; charset=utf-8; version=1",
+    "application/JSON",
+]
+
+
+@pytest.mark.parametrize("header", _charset_content_type_cases)
+def test_json_charset_content_type(header: str) -> None:
+    class HeadersHaberdasherSync(HaberdasherSync):
+        def make_hat(self, request, ctx):
+            return Hat(size=2)
+
+    transport = WSGITransport(HaberdasherWSGIApplication(HeadersHaberdasherSync()))
+
+    client = SyncClient(transport=transport)
+
+    res = client.post(
+        "http://localhost/connectrpc.example.Haberdasher/MakeHat",
+        content=b"{}",
+        headers={"content-type": header},
+    )
+    assert res.status == 200
+    assert res.json() == {"size": 2}
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("header", _charset_content_type_cases)
+async def test_json_charset_content_type_async(header: str) -> None:
+    class HeadersHaberdasher(Haberdasher):
+        async def make_hat(self, request, ctx):
+            return Hat(size=2)
+
+    transport = ASGITransport(HaberdasherASGIApplication(HeadersHaberdasher()))
+
+    client = Client(transport=transport)
+
+    res = await client.post(
+        "http://localhost/connectrpc.example.Haberdasher/MakeHat",
+        content=b"{}",
+        headers={"content-type": header},
+    )
+    assert res.status == 200
+    assert res.json() == {"size": 2}