I'm currently writing a server that needs to talk to a webserver. I'm not sure what should I use to bridge the gap between my server and the webserver, SCGI or the uWSGI Protocol. At some point I'd swear I read somewhere in the uwsgi documentation that the uWSGI protocol descends from SCGI but I can't find the line any more.
How do they differ?
On
Just say one point!
The uWSGI project aims at developing a full stack for building hosting services.
The uwsgi (lowercase!) protocol is the native protocol used by the uWSGI server.
And answer from Frequently Asked Questions (FAQ)
The uwsgi (all lowercase) protocol is derived from SCGI but with binary string length representations and a 4-byte header that includes the size of the var block (16 bit length) and a couple of general-purpose bytes.
They both serialize a simple list of key-value items. SCGI uses a text format for it while uwsgi (lowercase for the protocol) uses a binary encoding where each string is prefixed with a 16bit size: http://uwsgi-docs.readthedocs.org/en/latest/Protocol.html