Dec 27, 2022

HTTP request case sensitivity

I only recently learned that HTTP methods are case-sensitive. In order to save myself from future debugging headaches, I decided to do a quick search to see what else is case-sensitive.

This is what the RFC says. Real applications may treat things differently!

Case sensitive? Component Reference
HTTP version RFC
Method RFC
URI scheme RFC
URI host RFC
URI path, query, fragment RFC
Header field name RFC
Header field values Not explicit in the RFC. See below for some exceptions.
Transfer-coding header value RFC
Connection header value RFC




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