RemoteProtocolError: multiple Transfer-Encoding headers

Originally opened by @cancan101 on 2021-09-14 17:13:28 in encode/httpx

Running:

httpx.get('https://adobe.wd5.myworkdayjobs.com/en-US/external_experienced/job/San-Jose/Director--Corporate-Strategy_R109552-2')

produces RemoteProtocolError: multiple Transfer-Encoding headers.

Using requests, works fine:

requests.get('https://adobe.wd5.myworkdayjobs.com/en-US/external_experienced/job/San-Jose/Director--Corporate-Strategy_R109552-2').headers

{'transfer-encoding': 'chunked, chunked', 'Date': 'Tue, 14 Sep 2021 17:10:47 GMT', 'Vary': 'origin,access-control-request-method,access-control-request-headers,accept-encoding', 'Server': 'Workday User Interface Service', 'Set-Cookie': 'wd-browser-id=042c7ebd-81b7-429a-965d-05552e9dd259; Path=/; Secure; HTTPOnly, PLAY_SESSION=4920b9e5c981a4b74626cbea94ca58a36187f668-adobe_pSessionId=b44gglc1l9ehb4jtu4lr4q7blu&instance=wd5prvps0004d; SameSite=Lax; Path=/; Secure; HTTPOnly, wday_vps_cookie=2938515978.61490.0000; path=/; Httponly; Secure; SameSite=none', 'Content-Type': 'text/html;charset=UTF-8', 'X-Frame-Options': 'DENY', 'X-WD-REQUEST-ID': 'VPS|aecdf787-0e93-4a4f-ba57-6e1020d1eb00', 'Content-Encoding': 'gzip', 'Content-Language': 'en-US', 'Strict-Transport-Security': 'max-age=31536000; includeSubDomains'}

No source files or tests are named. Start by reproducing the request against the supplied Workday URL and trace where httpx parses the repeated Transfer-Encoding response headers. Done means establishing the intended handling for this response and adding coverage showing that the request no longer fails unexpectedly.