Spring ServletServerHttpRequest getHeaders() throws IllegalArgumentException instead of ignoring invalid content type */*

Spring Boot version 2.6.2

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Curl command:

curl localhost:8080/headers -H "Content-type:\*/\*"

Inside /headers method endpoint, when using ServletServerHttpRequest getHeaders() method produce the following result.

Actual result: java.lang.IllegalArgumentException: Content-Type cannot contain wildcard type '*'

Expected result: Exception should be ignored like what the comment say in the source code.

// Ignore: simply not exposing an invalid content type in HttpHeaders...

We cannot prevent someone out there to not craft this kind of curl command request.