Lichess API returns x-chess-pgn, even if get request asks for json

Hello,

I am trying to use the lichess API to get games in json format. However, even if I specify the content type as application/json in the get request, the API returns pgn.

How can I get it to return json as specified in the API documentation (https://lichess.org/api#tag/Games/operation/gamePgn)?

Example 1 using Invoke-RestMethod:
PS C:\Users\Admin-MO> Invoke-RestMethod -H @{"content-type"="application/json"} https://lichess.org/game/export/0RtRclR6 -v
VERBOSE: GET with 0-byte payload
VERBOSE: received 3612-byte response of content type application/x-chess-pgn
[Event "Rated Bullet game"]
[Site "https://lichess.org/0RtRclR6"]
[Date "2023.01.31"]
[White "someone"]
[Black "someoneelse"]
[Result "1-0"]
[UTCDate "2023.01.31"]
[UTCTime "16:59:02"]
[WhiteElo "2809"]
[BlackElo "2877"]
[WhiteRatingDiff "+7"]
[BlackRatingDiff "-7"]
[BlackTitle "IM"]
[Variant "Standard"]
[TimeControl "60+0"]
[ECO "C28"]
[Opening "Bishop's Opening: Vienna Hybrid, Hromádka Variation"]
[Termination "Time forfeit"]

Example 2 using curl:

PS C:\Users\Admin-MO> curl.exe -H "Content-Type: application/json" https://lichess.org/game/export/0RtRclR6 -v

• Trying 152.228.187.173:443...
• Connected to lichess.org (152.228.187.173) port 443 (#0)
• schannel: disabled automatic use of client certificate
• ALPN: offers http/1.1
• ALPN: server accepted http/1.1

GET /game/export/0RtRclR6 HTTP/1.1
Host: lichess.org
User-Agent: curl/7.83.1
Accept: /
Content-Type: application/json

• Mark bundle as not supporting multiuse
  < HTTP/1.1 200 OK
  < Server: nginx
  < Date: Tue, 31 Jan 2023 17:20:08 GMT
  < Content-Type: application/x-chess-pgn
  < Content-Length: 3612
  < Connection: keep-alive
  < Vary: Origin
  < Content-Disposition: attachment; filename=lichess_pgn_2023.01.31_doreality1991_vs_beatles_21.0RtRclR6.pgn
  < Access-Control-Allow-Origin: *
  < Access-Control-Allow-Headers: Origin, Authorization, If-Modified-Since, Cache-Control, Content-Type
  < Access-Control-Allow-Methods: OPTIONS, GET, POST, DELETE
  < Strict-Transport-Security: max-age=63072000; includeSubDomains; preload
  < X-Frame-Options: DENY
  < Permissions-Policy: interest-cohort=()
  <
  [Event "Rated Bullet game"]
  [Site "https://lichess.org/0RtRclR6"]
  [Date "2023.01.31"]
  [White "someone"]
  [Black "someoneelse"]
  [Result "1-0"]
  [UTCDate "2023.01.31"]
  [UTCTime "16:59:02"]
  [WhiteElo "2809"]
  [BlackElo "2877"]
  [WhiteRatingDiff "+7"]
  [BlackRatingDiff "-7"]
  [BlackTitle "IM"]
  [Variant "Standard"]
  [TimeControl "60+0"]
  [ECO "C28"]
  [Opening "Bishop's Opening: Vienna Hybrid, Hromádka Variation"]
  [Termination "Time forfeit"]

Hi!

Try changing your request header from "content-type" to "accept".

("accept" in the request header says that you want the server to respond in that format,
while "content-type" in the request header says that any data you send in your request is encoded in that format - but you are not sending any data)

Chess on!

Thank you, that of course solved it :)

Niiice woodwindblues!

Now you're a Master of the Lichess API, woop woop!
Use this skill wisely. :)

Chess on!