Responses to HEAD requests and certain status codes never contain a body #156
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This PR ensures we obey the HTTP specs and never send a response body for
HEAD
request. Similarly, certain status codes do not permit a message body.This happens automatically, so that consumers of this lib do not have to take care of this. This also applies to our error handling logic, which now uses the same routines to ensure an invalid
HEAD
request does not send a response body.See https://tools.ietf.org/html/rfc7230#section-3.3, https://tools.ietf.org/html/rfc7230#section-3.3.1 and https://tools.ietf.org/html/rfc7230#section-3.3.2
Builds on top of #152