Keep Link header parameter values that contain '='

parse_header_links split each parameter on '=' without a maxsplit, so a quoted
value containing '=' (allowed by RFC 8288) produced 3+ parts and raised
ValueError. The bare 'except ValueError: break' then silently dropped that
parameter and every parameter after it in the link.

Use split('=', 1) so the value keeps its '=' and later parameters survive.

Author: nyxst4ck

src/requests/utils.py

@@ -988,7 +988,7 @@ def parse_header_links(value: str) -> list[dict[str, str]]:
 
         for param in params.split(";"):
             try:
-                key, value = param.split("=")
+                key, value = param.split("=", 1)
             except ValueError:
                 break
 

tests/test_utils.py

@@ -690,6 +690,12 @@ def test_iter_slices(value, length):
                 {"url": "http://.../back.jpeg"},
             ],
         ),
+        (
+            # A quoted parameter value may itself contain "=" (RFC 8288);
+            # it must be kept and must not drop the parameters after it.
+            '<http:/.../front.jpeg>; title="a=b"; rel="next"',
+            [{"url": "http:/.../front.jpeg", "title": "a=b", "rel": "next"}],
+        ),
         ("", []),
     ),
 )