ContentTypeListener checking contents of DELETE requests, but these cannot have content

[weierophinney]

Hello,

in the ContentTypeListener, in the __invoke function, checks are done for the content of a DELETE request. Per the spec, DELETE requests should not have a payload.

If I send a delete request with an application/json content-type, this will fail, because it will try to parse an empty content as JSON.

In my opinion, the DELETE should be removed from the switch statement.

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Originally posted by @AxaliaN at zfcampus/zf-content-negotiation#87

[weierophinney]

Related to: zfcampus/zf-content-negotiation#29

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Originally posted by @Wilt at zfcampus/zf-content-negotiation#87 (comment)