Bug 1364695 - Make `mach artifact toolchain` also retry on ConnectionError. r=gps

python/mozbuild/mozbuild/mach_commands.py

@@ -1784,12 +1784,18 @@ class PackageFrontend(MachCommandBase):
                                                      sleeptime=60)):
                 try:
                     record.fetch_with(cache)
-                except requests.exceptions.HTTPError as e:
-                    status = e.response.status_code
+                except (requests.exceptions.HTTPError,
+                        requests.exceptions.ConnectionError) as e:
+
+                    if isinstance(e, requests.exceptions.ConnectionError)
+                        should_retry = True
+                    else:
                         # The relengapi proxy likes to return error 400 bad request
                         # which seems improbably to be due to our (simple) GET
                         # being borked.
+                        status = e.response.status_code
                         should_retry = status >= 500 or status == 400
+
                     if should_retry or attempt < retry:
                         level = logging.WARN
                     else: