add proxy for the first part and try to develop the second part

Webcal-python/venv/lib/python3.11/site-packages/ics/tools.py

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+import re
+
+
+def striphtml(data):
+    p = re.compile(r'<.*?>')
+    return p.sub('', data)
+
+
+def validate(string):
+    import requests
+    payload = {'snip': string}
+    ret = requests.post('http://severinghaus.org/projects/icv/', data=payload)
+    if 'Sorry, your calendar could not be parsed.' in ret.text:
+        i = ret.text.index('<div class="parse-error">')
+        j = ret.text[i:].index('</div>')
+        usefull = ret.text[i:i + j]
+        usefull_clean = striphtml(usefull)
+        lines = usefull_clean.split('\n')
+        lines_clean = map(lambda x: x.strip(), lines)
+        lines_no_empty = filter(lambda x: x != '', lines_clean)
+        return '\n'.join(lines_no_empty)
+
+    elif 'Congratulations; your calendar validated!' in ret.text:
+        return True
+    else:
+        return None