checks.network: use HEAD instead of GET for requests

This might be reverted at some point if partial message body content is
pulled for file content type verification for distfiles, but then
streaming mode should be properly set as well so all the content isn't
downloaded.

Author: radhermit

src/pkgcheck/checks/network.py

@@ -111,7 +111,7 @@ def _http_check(self, url, *, pkg):
         """Check http:// and https:// URLs using requests."""
         result = None
         try:
-            r = self.session.get(url)
+            r = self.session.head(url)
 
             redirected_url = None
             for response in r.history:
@@ -138,7 +138,7 @@ def _https_available_check(self, url, *, future, orig_url, pkg):
         """Check if https:// alternatives exist for http:// URLs."""
         result = None
         try:
-            r = self.session.get(url)
+            r = self.session.head(url)
 
             redirected_url = None
             for response in r.history: