HTTP request case sensitivity

The following is a summary of which HTTP fields/components are case sensitive.

https://misfra.me/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
✅	Body

Summary

Case-sensitive:

HTTP version
Method
URI path, query, fragment
Header field values
Body

Case-insensitive:

URI scheme
URI host
Header field name
Transfer-coding header value
Connection header value

#reads #preetam jinka #http