shreemaan-abhishek opened a new pull request, #13320:
URL: https://github.com/apache/apisix/pull/13320
### Description
The `ai-proxy` plugin currently rejects any request whose body does not
match a known protocol (openai-chat, openai-responses, openai-embeddings,
anthropic-messages, bedrock-converse), making it impossible to proxy
OpenAI-compatible APIs whose body shape isn't recognized — for example
`/v1/images/generations`, whose `{prompt, model, n, size}` body matches no
existing matcher. This PR adds a `passthrough` protocol adapter that is
registered last in the detection order and matches any non-empty JSON body,
acting as a catch-all. When selected, the plugin forwards the request body
unchanged to the upstream using `ctx.var.uri` (or `override.endpoint` when
configured) as the target path; only model rewrite (`options.model`), auth
header injection (`auth.header`), and endpoint override (`override.endpoint`)
are applied. All other protocol hooks (SSE parsing, usage extraction, message
manipulation, response text extraction) return safe no-op values, so
passthrough imposes zero parsing c
ost and stays out of the way of arbitrary upstream payloads.
#### Which issue(s) this PR fixes:
Fixes #
### Checklist
- [x] I have explained the need for this PR and the problem it solves
- [x] I have explained the changes or the new features added to this PR
- [x] I have added tests corresponding to this change
- [ ] I have updated the documentation to reflect this change
- [x] I have verified that this change is backward compatible (If not,
please discuss on the [APISIX mailing
list](https://github.com/apache/apisix/tree/master#community) first)
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