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94ffc18332
Per https://datatracker.ietf.org/doc/html/rfc9110#name-user-agent a User-Agent is defined as follows: ``` User-Agent = product *( RWS ( product / comment ) ) ``` Where ``` product = token ["/" product-version] product-version = token ``` In this case, `token` is defined in RFC 7230 - https://datatracker.ietf.org/doc/html/rfc7230#section-3.2.6: ``` token = 1*tchar tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA ; any VCHAR, except delimiters ``` or, in the original RFC 2616 - https://datatracker.ietf.org/doc/html/rfc2616#section-2.2 (next page): ``` token = 1*<any CHAR except CTLs or separators> separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <"> | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT ``` which means that a `token` cannot have whitespace. Not sure if this should be in the breaking changelog section - theoretically, some clients might've relied on the old Nim user-agent? For some extra info, some other languages seem to have adopted the same hyphen user agent to specify the language + module, e.g.: - https://github.com/python/cpython/blob/main/Lib/urllib/request.py#L1679 (`Python-urllib/<version>`) Fixes #22862.