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webfs: check $httpproxy and error when its bogus

the httpproxy environment variable needs to be a url as stated
in the manpage, so give an error when it isnt.

--- a/sys/src/cmd/webfs/fs.c

+++ b/sys/src/cmd/webfs/fs.c

@@ -820,6 +820,8 @@

 	if(s = getenv("httpproxy")){

 		proxy = saneurl(url(s, 0));

+		if(proxy == nil || strcmp(proxy->scheme, "http") && strcmp(proxy->scheme, "https"))

+			sysfatal("invalid httpproxy url: %s", s);

 		free(s);

 	}