veb,vweb: MIME types should be case insensitive

[alex-semenyuk]

Close #22425

As mentioned at #22425 MIME types should be case insensitive. So if we have .TXT or .JPG it should be valid as .txt and .jpg

[spytheman]

Good work.

[JalonSolov]

Question: Shouldn't veb be using the net.http.mime module, instead of partially duplicating the MIME types that are already in there?

[spytheman]

Question: Shouldn't veb be using the net.http.mime module, instead of partially duplicating the MIME types that are already in there?

Ideally yes, but realistically - no.

The DB in net.http.mime is huge when uncompressed, and with the current implementation of net.http.mime and the current compiler, means both much bigger veb executables (+2.1MB without -prod, +396KB with -prod), and much more time, spend during optimization (compilation with -prod), for producing each of them:

The current smaller mime map in veb and vweb before that, favors much faster iteration and smaller executables, which I think is the right balance for both modules, until they mature.