Remove (debug 0) because it won't make any differences.
Fix the load-time error of fast-http-test.
Change (safety 0) -> (safety 2) in 'http-parse' for safety.
Call :body-callback only once if Content-Length header is present.
Fix log:debug.
Add tests and fix many bugs.
Rewrite number-string-p without using cl-ppcre.
Add :force-stream to HTTP.