1.2 KiB
| @modelcontextprotocol/server | @modelcontextprotocol/client | @modelcontextprotocol/hono | @modelcontextprotocol/node |
|---|---|---|---|
| patch | patch | patch | patch |
POSTs whose Content-Type media type is not application/json are now
rejected with 415 Unsupported Media Type; the header is parsed instead of
substring-matched. Previously any value merely containing the substring
passed the check (for example text/plain; a=application/json), case
variants were wrongly rejected, and the 2026-07-28 entry did not inspect
Content-Type at all — requests with a missing or non-JSON header that used
to be served on that path now also answer 415. Values with parameters
(application/json; charset=utf-8, including malformed parameter sections
like application/json;) continue to work. SDK clients always send the
correct header and are unaffected.
The new isJsonContentType(header) helper is exported for transport and
framework-adapter authors — custom entries composing the exported building
blocks (classifyInboundRequest, PerRequestHTTPServerTransport) must apply
it themselves. The hono adapter's JSON body pre-parse and the client's
response dispatch now use the same parsed-media-type comparison.