[Schema Inaccuracy] Improper response type for /octocat #5178
Description
Schema Inaccuracy
The endpoint https://api.github.com/octocat declares only one response: an application/octocat-stream (not octet-stream).
As fun as it is, it prevents using this endpoint from, say, the GitHub CLI:
gh api --verbose /octocat:
* Request at 2025-08-07 21:59:18.1013867 +0200 CEST m=+0.051982601
* Request to https://api.github.com/octocat
> GET /octocat HTTP/1.1
> Host: api.github.com
> Accept: */*
> Authorization: token ████████████████████
> Content-Type: application/json; charset=utf-8
> Time-Zone: Europe/Berlin
> User-Agent: GitHub CLI 2.43.1
< HTTP/2.0 200 OK
< Access-Control-Allow-Origin: *
< Access-Control-Expose-Headers: ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset
< Content-Length: 873
< Content-Security-Policy: default-src 'none'
< Content-Type: application/octocat-stream
< Date: Thu, 07 Aug 2025 19:59:20 GMT
< Referrer-Policy: origin-when-cross-origin, strict-origin-when-cross-origin
< Server: github.com
< Strict-Transport-Security: max-age=31536000; includeSubdomains; preload
< Vary: Accept-Encoding, Accept, X-Requested-With
< X-Content-Type-Options: nosniff
< X-Frame-Options: deny
< X-Github-Api-Version-Selected: 2022-11-28
< X-Github-Request-Id: F84E:2CFBD5:440694:3DAEC6:68950597
< X-Ratelimit-Limit: 5000
< X-Ratelimit-Remaining: 4972
< X-Ratelimit-Reset: 1754597128
< X-Ratelimit-Resource: core
< X-Ratelimit-Used: 28
< X-Xss-Protection: 0
* Request took 314.4962ms
...with no octocat in sight.
The request even fails when explicitly only accepting any other content type.
Expected
I would expect the endpoint to declare that it returns a text/plain body, both in the spec as well as in the actual response.
Also, it should allow requests with Accept: text/plain in the request headers.
Reproduction Steps
For the above output:
gh api --verbose /octocat
For the failure with a different Accept header:
gh api --verbose /octocat -H "Accept: application/octocat-stream"
or:
gh api --verbose /octocat -H "Accept: text/plain"