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Adam C. Foltzer
20fa5c9dbf
Add a new extension type `hyper::ext::ReasonPhrase` gated by either the `ffi` or `http1` Cargo features. When enabled, store any non-canonical reason phrases in this extension when parsing responses, and write this reason phrase instead of the canonical reason phrase when emitting responses. Reason phrases are a disused corner of the spec that implementations ought to treat as opaque blobs of bytes. Unfortunately, real-world traffic sometimes does depend on being able to inspect and manipulate them. Non-canonical reason phrases are checked for validity at runtime to prevent invalid and dangerous characters from being emitted when writing responses. An `unsafe` escape hatch is present for hyper itself to create reason phrases that have been parsed (and therefore implicitly validated) by httparse.