Media type fails to match types with multiple '+' characters [SPR-15795]

[spring-issuemaster]

Ben Draut opened SPR-15795 and commented

The logic in MimeType.includes and MimeType.isCompatibleWith appears to have a bug, in that they assume there will only be one + character in the media type string.

For example, application/*+json does not include a media type of the form application/x.y+z+json.

My understanding from the RFC is that multiple + characters are allowed, and everything following the last + defines the syntax suffix.

The code in MimeType is using ```
indexOf('+')

```lastIndexOf('+')
``` instead.

Steps to reproduce:

Use `RestTemplate` to make an HTTP request with a custom `Content-Type` header of `application/x.y+z+json`. An error is thrown:

org.springframework.web.client.RestClientException: Could not write request: no suitable HttpMessageConverter found for request type...

Proposed change: https://github.com/spring-projects/spring-framework/pull/1481

---

Referenced from: pull request #1481, and commits d7a7b08

[spring-issuemaster]

Rossen Stoyanchev commented

More current spec RFC 6838, section 4.2.