Add the default accept value for chat completions

[c121914yu]

• I understand that this repository is auto-generated and my pull request may not be merged

Changes being requested

Add the default headers Accept for chat completions.

Additional context & links

I found the stream requesting unavailable after upgrading from 3.x to 4.x. I checked both versions of the request header. And I found that the default Accept of version 3.x is "application/json, text/plain, /", but the default in version 4.x is only "application/json".

When I tried to rewrite the request header in 4.x, I found that the request completed successfully.

Of course, I am not requesting api.openapi.com directly, but I think this "Accept " value should be relaxed to make it compatible with more third-party systems.

[rattrayalex]

Thanks for the PR, we'll take a look soon

[rattrayalex]

We don't want to change Accept globally (as implemented here), but we do want to send the correct Accept header for streaming requests.

You can follow #375 where we are tracking this.

In the meantime, as you noted, you can work around this with a second { headers: { Accept: 'text/event-stream' } }, argument.