[feugy]

🖖 What's in there?

Fixes a 500 on malformed Content-Type headers in buffer(), text() and json().

buffer() parses the charset with content-type while it builds the getRawBody() options, so the parse runs before the .catch() that maps body errors. A header like Content-Type: application/json; (trailing semicolon) throws a raw TypeError: invalid parameter format, so micro answers with a 500. The fix wraps the parse and throws createError(400, 'Invalid Content-Type header', err), like the existing Invalid JSON and Invalid body errors.

Before	Now
500 Internal Server Error	400 Invalid Content-Type header

🤺 How to test?

curl -i -X POST localhost:3000 -H 'Content-Type: application/json;' -d '{}'

New tests in test/suite/index.ts:

• json() returns 400 for application/json;, application/json; charset, application/json;; charset=utf-8 and application.
• text() returns 400 for text/plain;.
• buffer() with an explicit encoding still skips the parse.
• json() still parses a body sent with application/json; charset=utf-8.

Without the fix, the 5 invalid-header tests fail with Internal Server Error.

🔬 Notes to reviewers

• prettier-check in packages/micro fails on the generated types/*.d.ts files, also on main without this change.

🔗 Related PRs

• fix: return 400 for malformed Content-Type header (9.x) #496: same fix for 9.x, for services that still use micro@9.3.5-canary.3.