Avoid modifying method on HEAD requests #353
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Traefik sends a forward auth request for every request, including HEAD methods, in order to validate if a request can continue. Due to Go HTTP client being strict to the HTTP SPEC, the response of a HEAD does not include a body, while Traefik expects a validation response to be embedded, causing errors. To mitigate this, when a X-Forwarded-Method is set as HEAD, we'll avoid modifying the HTTP Method response in order to send a body back, allowing head requests to by validated. This is necessary even if an allow rule is set, otherwhise it will fail as well. Mitagates: thomseddon#156
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Traefik sends a forward auth request for every request, including HEAD methods, in order to validate if a request can continue.
Due to Go HTTP client being strict to the HTTP SPEC, the response of a HEAD does not include a body, while Traefik expects a validation response to be embedded, causing errors.
To mitigate this, when a X-Forwarded-Method is set as HEAD, we'll avoid modifying the HTTP Method response in order to send a body back, allowing head requests to by validated.
This is necessary even if an allow rule is set, otherwhise it will fail as well.
Mitagates: #156