Merge pull request #18157 from RandomShaper/improve-uri-utils-3.0

Improve/fix URI utils (3.0)

doc/classes/HTTPClient.xml

@@ -111,6 +111,12 @@
 				String queryString = httpClient.query_string_from_dict(fields)
 				returns:= "username=user&password=pass"
 				[/codeblock]
+				Furthermore, if a key has a null value, only the key itself is added, without equal sign and value. If the value is an array, for each value in it a pair with the same key is added.
+				[codeblock]
+				var fields = {"single": 123, "not_valued": null, "multiple": [22, 33, 44]}
+				String queryString = httpClient.query_string_from_dict(fields)
+				returns:= "single=123&not_valued&multiple=22&multiple=33&multiple=44"
+				[/codeblock]
 			</description>
 		</method>
 		<method name="read_response_body_chunk">