angular-cn/aio/aio-builds-setup/docs/overview--http-status-codes.md

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# Overview - HTTP Status Codes
This is a list of all the possible HTTP status codes returned by the nginx and preview servers, along
with a brief explanation of what they mean:
## `http://*.ngbuilds.io/*`
- **307 (Temporary Redirect)**:
All non-HTTPS requests. 308 (Permanent Redirect) would be more appropriate, but is not supported
by all agents (e.g. cURL).
## `https://pr<pr>-<sha>.ngbuilds.io/*`
- **200 (OK)**:
File was found or URL was rewritten to `/index.html` (i.e. all paths that have no `.` in final
segment).
- **403 (Forbidden)**:
Trying to access a sub-directory.
- **404 (Not Found)**:
File not found.
## `https://ngbuilds.io/can-have-public-preview/<pr>`
- **200 (OK)**:
Whether the PR can have a public preview (based on its author, label, changed files).
_Response type:_ JSON
_Response format:_
```ts
{
canHavePublicPreview: boolean,
reason: string | null,
}
```
- **405 (Method Not Allowed)**:
Request method other than GET.
## `https://ngbuilds.io/circle-build`
- **201 (Created)**:
Build deployed successfully and is publicly available.
- **202 (Accepted)**:
Build not automatically verifiable. Stored for later deployment (after re-verification).
- **204 (No Content)**:
Build was not successful, so no further action is being taken.
- **400 (Bad Request)**:
Invalid payload.
- **403 (Forbidden)**:
Unable to talk to 3rd-party APIs.
- **405 (Method Not Allowed)**:
Request method other than POST.
- **409 (Conflict)**:
Request to overwrite existing (public or non-public) directory (e.g. deploy existing build or
change PR visibility when the destination directory does already exist).
## `https://ngbuilds.io/health-check`
- **200 (OK)**:
The server is healthy (i.e. up and running and processing requests).
## `https://ngbuilds.io/pr-updated`
- **200 (OK)**:
Request processed successfully. Processing may or may not have resulted in further actions.
- **400 (Bad Request)**:
No payload or no `number` field in payload.
- **405 (Method Not Allowed)**:
Request method other than POST.
- **409 (Conflict)**:
Request to overwrite existing (public or non-public) directory (i.e. directories for both
visibilities exist).
(Normally, this should not happen.)
## `https://*.ngbuilds.io/*`
- **404 (Not Found)**:
Request not matched by the above rules.
- **500 (Internal Server Error)**:
Error while processing a request matched by the above rules.