HeaderValuesContainsToken reports whether any string in values contains the provided token, ASCII case-insensitively.

PunycodeHostPort returns the IDNA Punycode version of the provided "host" or "host:port" string.

ValidHeaderFieldName reports whether v is a valid HTTP/1.x header name.

ValidHeaderFieldValue reports whether v is a valid "field-value" according to http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2 : message-header = field-name ":" [ field-value ] field-value = *( field-content | LWS ) field-content = <the OCTETs making up the field-value and consisting of either *TEXT or combinations of token, separators, and quoted-string> http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2 : TEXT = <any OCTET except CTLs, but including LWS> LWS = [CRLF] 1*( SP | HT ) CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)> RFC 7230 says: field-value = *( field-content / obs-fold ) obj-fold = N/A to http2, and deprecated field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ] field-vchar = VCHAR / obs-text obs-text = %x80-FF VCHAR = "any visible [USASCII] character" http2 further says: "Similarly, HTTP/2 allows header field values that are not valid.

ValidHostHeader reports whether h is a valid host header.