winhttp: WinHttpQueryDataAvailable should do a blocking read if more data is expected.
[wine] / dlls / winhttp /
drwxr-xr-x   ..
-rw-r--r-- 342 Makefile.in
-rw-r--r-- 4567 handle.c
-rw-r--r-- 3672 main.c
-rw-r--r-- 18872 net.c
-rw-r--r-- 62607 request.c
-rw-r--r-- 20421 session.c
drwxr-xr-x - tests
-rw-r--r-- 1488 winhttp.spec
-rw-r--r-- 6216 winhttp_private.h