Enhanced internet connection checks by falling back to HTTPS protocol when HTTP (port 80) fails // Resolve #4980

HISTORY.rst

@@ -22,6 +22,7 @@ test-driven methodologies, and modern toolchains for unrivaled success.
 ~~~~~~~~~~~~~~~~~~~
 
 * Introduced the `PLATFORMIO_SYSTEM_TYPE <https://docs.platformio.org/en/latest/envvars.html#envvar-PLATFORMIO_SYSTEM_TYPE>`__ environment variable, enabling manual override of the detected system type for greater flexibility and control in custom build environments
+* Enhanced internet connection checks by falling back to HTTPS protocol when HTTP (port 80) fails (`issue #4980 <https://github.com/platformio/platformio-core/issues/4980>`_)
 * Upgraded the build engine to the latest version of SCons (4.8.1) to improve build performance, reliability, and compatibility with other tools and systems (`release notes <https://github.com/SCons/scons/releases/tag/4.8.1>`__)
 * Upgraded the `Doctest <https://docs.platformio.org/en/latest/advanced/unit-testing/frameworks/doctest.html>`__ testing framework to version 2.4.11, the `GoogleTest <https://docs.platformio.org/en/latest/advanced/unit-testing/frameworks/doctest.html>`__ to version 1.15.2, and the `Unity <https://docs.platformio.org/en/latest/advanced/unit-testing/frameworks/unity.html>`__ to version 2.6.0, incorporating the latest features and improvements for enhanced testing capabilities
 * Corrected an issue where the incorrect public class was imported for the ``DoctestTestRunner`` (`issue #4949 <https://github.com/platformio/platformio-core/issues/4949>`_)

platformio/http.py

@@ -190,10 +190,11 @@ class HTTPClient:
 @util.memoized(expire="10s")
 def _internet_on():
     timeout = 2
+    use_proxy = is_proxy_set()
     socket.setdefaulttimeout(timeout)
     for host in __check_internet_hosts__:
         try:
-            if is_proxy_set():
+            if use_proxy:
                 requests.get("http://%s" % host, allow_redirects=False, timeout=timeout)
                 return True
             # try to resolve `host` for both AF_INET and AF_INET6, and then try to connect
@@ -203,6 +204,15 @@ def _internet_on():
             return True
         except:  # pylint: disable=bare-except
             pass
+
+    # falling back to HTTPs, issue #4980
+    for host in __check_internet_hosts__:
+        try:
+            requests.get("https://%s" % host, allow_redirects=False, timeout=timeout)
+        except requests.exceptions.RequestException:
+            pass
+        return True
+
     return False