Here's a list of the ones I've found that aren't supported:

IIS

• [ ] 440 Login Timeout
• [ ] 449 Retry With

nginx

• [ ] 495 SSL Certificate Error
• [ ] 496 SSL Certificate Required
• [x] 497 HTTP request sent to HTTPS port (idea: maybe have an image of a cat trying to go through a dog door for this?) (Added by #124)

Cloudflare

• [ ] 520 Web Server Returned an Unknown Error
• [x] 521 Web Server Is Down
• [ ] 522 Connection Timed Out
• [x] 523 Origin Is Unreachable
• [x] 524 A Timeout Occurred
• [x] 525 SSL Handshake Failed
• [ ] 526 Invalid SSL Certificate
• [ ] 527 Railgun Error
• [ ] 530

AWS ELB

• [ ] 460
• [ ] 463 (maybe an image of 30 cats trying to do into a box at once?)
• [ ] 561 Unauthorized

Note: I got all these from The Wikipedia Page

521 was added with https://github.com/httpcats/http.cat/pull/119/files

Perhaps worth adding a comment in those PRs linking to this issue for reference.

521 was added with https://github.com/httpcats/http.cat/pull/119/files

Perhaps worth adding a comment in those PRs linking to this issue for reference.

Oh, didn't see that one when I looked at that PR, thanks for the catch!

Looking at the httpstatuses.com as a reference, has some more missing status like these of list bellow:

2×× Success

• [ ] 205 Reset Content ~ Already reported #114
• [ ] 208 Already Reported
• [ ] 226 IM Used

4×× Client Error

• [ ] 428 Precondition Required

5×× Server Error

• [ ] 505 HTTP Version Not Supported

TIA, Geo :)

By the way, we should probably just copy 401 into 561, will create a PR for that

There are also upcoming 103 Early hints. Probably useless though.

• https://twitter.com/glenngabe/status/1431234216105324544
• https://blog.chromium.org/2021/08/chrome-94-beta-webcodecs-webgpu.html

195 too

Hi there, I've checked the current state and found that some statuses mentioned in this issue (and not marked yet) were added already.

• 205, 208, 226: #181
• 428: #166
• 522: #137
• 530: #167