All http header keys coming as lower case in ConnectionRequest.headers of Autobahn websocket server

Question

Why does autobahn web socket server change all http header keys to lower case? I need to implement authentication token in header with OAuth2 standard with custom header 'Authorization:Bearer $token'. But it seems from autobahn 'request.headers' in onConnect method of WebSocketServerProtocol class all the keys are changed to lower case. What is the reason behind this? Can I use 'authorization' instead of 'Authorization' as the key to fetch auth token from request in this scenario?

Answer 1

According to the HTTP RFC, "HTTP header ... field names are case-insensitive." In your example, any of the following incoming header spellings are equivalent: "Authorization", "authorization", "AuThOrIzAtIoN".

The software in question lower-casifies the header to make lookups easier. You should always use the lower-case version as the key.