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Within a mime header, is white space allowed between the header field-name and ‘:’ separator? For example, are:
Content-Type: <value>
and
Content-Type : <value>
equivalent?
Also, can you please provide a pointer to the mime standard where this is described? I checked a few but did not find it.
Thanks
It isn’t entirely clear whether it is or is not allowed, by the standard. However, implementations vary in how they handle whitespace between header field names and the colon. I would highly recommend avoiding whitespace there if you can.
The RFC for reference. This somewhat old article discusses the issue for HTTP headers, a similar standard.