Fix for gen-delims escaping behaviour in path/query/fragment (#2701)

httpx/_urlparse.py

@@ -253,12 +253,19 @@ def urlparse(url: str = "", **kwargs: typing.Optional[str]) -> ParseResult:
     if has_authority:
         path = normalize_path(path)
 
-    parsed_path: str = quote(path, safe=SUB_DELIMS + ":@/")
+    # The GEN_DELIMS set is... : / ? # [ ] @
+    # These do not need to be percent-quoted unless they serve as delimiters for the
+    # specific component.
+
+    # For 'path' we need to drop ? and # from the GEN_DELIMS set.
+    parsed_path: str = quote(path, safe=SUB_DELIMS + ":/[]@")
+    # For 'query' we need to drop '#' from the GEN_DELIMS set.
     parsed_query: typing.Optional[str] = (
-        None if query is None else quote(query, safe=SUB_DELIMS + "/?")
+        None if query is None else quote(query, safe=SUB_DELIMS + ":/?[]@")
     )
+    # For 'fragment' we can include all of the GEN_DELIMS set.
     parsed_fragment: typing.Optional[str] = (
-        None if fragment is None else quote(fragment, safe=SUB_DELIMS + "/?")
+        None if fragment is None else quote(fragment, safe=SUB_DELIMS + ":/?#[]@")
     )
 
     # The parsed ASCII bytestrings are our canonical form.

tests/test_urlparse.py

@@ -247,3 +247,33 @@ def test_copy_with():
 
     url = url.copy_with(path="/abc")
     assert str(url) == "http://example.com/abc"
+
+
+# Tests for percent encoding across path, query, and fragement...
+
+
+def test_path_percent_encoding():
+    # Test percent encoding for SUB_DELIMS ALPHA NUM and allowable GEN_DELIMS
+    url = httpx.URL("https://example.com/!$&'()*+,;= abc ABC 123 :/[]@")
+    assert url.raw_path == b"/!$&'()*+,;=%20abc%20ABC%20123%20:/[]@"
+    assert url.path == "/!$&'()*+,;= abc ABC 123 :/[]@"
+    assert url.query == b""
+    assert url.fragment == ""
+
+
+def test_query_percent_encoding():
+    # Test percent encoding for SUB_DELIMS ALPHA NUM and allowable GEN_DELIMS
+    url = httpx.URL("https://example.com/?!$&'()*+,;= abc ABC 123 :/[]@" + "?")
+    assert url.raw_path == b"/?!$&'()*+,;=%20abc%20ABC%20123%20:/[]@?"
+    assert url.path == "/"
+    assert url.query == b"!$&'()*+,;=%20abc%20ABC%20123%20:/[]@?"
+    assert url.fragment == ""
+
+
+def test_fragment_percent_encoding():
+    # Test percent encoding for SUB_DELIMS ALPHA NUM and allowable GEN_DELIMS
+    url = httpx.URL("https://example.com/#!$&'()*+,;= abc ABC 123 :/[]@" + "?#")
+    assert url.raw_path == b"/"
+    assert url.path == "/"
+    assert url.query == b""
+    assert url.fragment == "!$&'()*+,;= abc ABC 123 :/[]@?#"