silverdr
Given that HTTP/1.1 RFC says:
HTTP header fields, […] follow the same generic format as that given in Section 3.1 of RFC 822 [9]. Each header field consists of a name followed by a colon (“:”) and the field value. Field names are case-insensitive.
and e. g. section 6.2 (and all other sources I checked) list response headers keys in mixed case, what is the point of:
Plug.Conn.InvalidHeaderError) header key is not lowercase: "WWW-Authenticate"
error I receive when testing the functionality, which returns the above header?
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silverdr
Thank you for pointing this out. Now I know where it comes from. Apparently I was so baffled that I didn’t even think this could be a documented “feature”.
al2o3cr
The comment in the documentation for
Plug.Conn.put_req_headersounds VERY relevant:https://github.com/elixir-plug/plug/blob/f7fbe26e7148374c4d37bde41540be2844056aa1/lib/plug/conn.ex#L627-L633