Fix issue with OECD server not supporting RFC 5746

scraper.py

@@ -11,9 +11,35 @@
 CRS_CODES_URL = "https://stats.oecd.org/ModalDimWebTree.aspx?DimensionCode=SECTOR&SubSessionId={}&Random=0.2017416214402572"
 
 
+# from https://stackoverflow.com/a/73519818
+
+import urllib3
+import ssl
+
+class CustomHttpAdapter (requests.adapters.HTTPAdapter):
+    # "Transport adapter" that allows us to use custom ssl_context.
+
+    def __init__(self, ssl_context=None, **kwargs):
+        self.ssl_context = ssl_context
+        super().__init__(**kwargs)
+
+    def init_poolmanager(self, connections, maxsize, block=False):
+        self.poolmanager = urllib3.poolmanager.PoolManager(
+            num_pools=connections, maxsize=maxsize,
+            block=block, ssl_context=self.ssl_context)
+
+
+def get_legacy_session():
+    ctx = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
+    ctx.options |= 0x4  # OP_LEGACY_SERVER_CONNECT
+    session = requests.session()
+    session.mount('https://', CustomHttpAdapter(ctx))
+    return session
+
+
 class CodesGetter():
     def get_doc(self):
-        s = requests.Session()
+        s = get_legacy_session()
         s.headers.update({'User-Agent': 'Mozilla/5.0'})
         s.get(OECD_STATS_URL)
         req_crs = s.get(CRS_URL.format(self.lang))