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Ran 29 Jun 2026 02:49PM UTC

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Build # 28380795187

Build Type

push

github

Committed by

web-flow

Commit Message

fix(functions_client): use case-insensitive check for Content-Type header in invoke() (#1486)

## Description

Closes #1487

Per RFC 7230, HTTP header names are case-insensitive. Previously,
`FunctionsClient.invoke()` checked whether a `Content-Type` header was
provided using exact string match:
`!headers.containsKey("Content-Type")`.

If a caller passed a custom content-type header with lowercase or mixed
casing (such as `headers: {'content-type': 'application/custom+json'}`),
the check failed to detect it. Consequently, the default content-type
for the body type was assigned to `finalHeaders['Content-Type']`,
overwriting the caller's custom header when headers were set on the
request.

## Fix

Switched the check to a case-insensitive lookup over `finalHeaders.keys`
before setting default body content types.

## Test Plan

Added a unit test in
`packages/functions_client/test/functions_dart_test.dart` verifying that
passing `headers: {'content-type': 'application/custom+json'}` correctly
overrides default headers. All 37 tests in the package pass.

---------

Co-authored-by: Lukas Klingsbo <lukas.klingsbo@gmail.com>

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