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Add wildcard '*' to the Accept header in response to API requests. #683

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Add wildcard '*' to the Accept header in response to API requests. #683

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4 changes: 4 additions & 0 deletions src/mcp/server/streamable_http.py
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@
# Content types
CONTENT_TYPE_JSON = "application/json"
CONTENT_TYPE_SSE = "text/event-stream"
CONTENT_TYPE_ALL = "*/*"

# Special key for the standalone GET stream
GET_STREAM_KEY = "_GET_stream"
Expand Down Expand Up @@ -282,6 +283,9 @@ async def handle_request(self, scope: Scope, receive: Receive, send: Send) -> No
def _check_accept_headers(self, request: Request) -> tuple[bool, bool]:
"""Check if the request accepts the required media types."""
accept_header = request.headers.get("accept", "")
if accept_header == CONTENT_TYPE_ALL:
return True, True

accept_types = [media_type.strip() for media_type in accept_header.split(",")]

has_json = any(
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