Catch urllib.error.URLError to prevent crashes

Fixes kurtmckee#239

Author: kurtmckee

NEWS

@@ -1,5 +1,8 @@
 coming in the next release:
 
+6.0.7 - 21 June 2021
+    *   Catch ``urllib.error.URLError`` to prevent crashes. (#239)
+
 6.0.6 - 15 June 2021
     *   Prevent an AttributeError that occurs when a server returns HTTP 3xx
         but doesn't include a Location header as well. (#267)

feedparser/api.py

@@ -27,6 +27,7 @@
 # POSSIBILITY OF SUCH DAMAGE.
 
 import io
+import urllib.error
 import urllib.parse
 import xml.sax
 
@@ -211,7 +212,14 @@ def parse(url_file_stream_or_string, etag=None, modified=None, agent=None, refer
         headers={},
     )
 
-    data = _open_resource(url_file_stream_or_string, etag, modified, agent, referrer, handlers, request_headers, result)
+    try:
+        data = _open_resource(url_file_stream_or_string, etag, modified, agent, referrer, handlers, request_headers, result)
+    except urllib.error.URLError as error:
+        result.update({
+            'bozo': True,
+            'bozo_exception': error,
+        })
+        return result
 
     if not data:
         return result