NewBadFramingModifier makes a best effort to fix inconsistencies in the request such as multiple Content-Lengths or the lack of Content-Length and improper Transfer-Encoding.

NewForwardedModifier sets the X-Forwarded-For, X-Forwarded-Proto, X-Forwarded-Host, and X-Forwarded-Url headers.

NewHopByHopModifier removes Hop-By-Hop headers from requests and responses.

NewViaModifier returns a new Via modifier.

ViaModifier is a header modifier that checks for proxy redirect loops.