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How to fix a provider's header or field quirk with rewrite rules with Osw

Add, drop, or pin request fields for one provider using rewrite rules and a built-in test check.

Who it is forA developer whose provider rejects requests unless a header is set or a field has a specific value.

The problemSome providers need a custom User-Agent, reject a header a client sends, or expect a fixed parameter value, and the client tool offers no setting for this.

The outcomeA request rewrite rule changes the outgoing request for that provider only, and the editor's test case confirms the change before you rely on it.

What you need first

  • A Mac, Windows PC, or Linux machine that can run the OSW installer
  • API keys for at least two LLM channels you own
  • An AI client that lets you set a custom base URL

Steps

  1. Open Request Rewrite and pick a template behind New rule, or start a blank rule.
  2. Set the change you need, such as adding a User-Agent header, dropping a header, or pinning a field to a value.
  3. Run the test case in the editor to confirm the rewritten request looks correct.
  4. Save the rule and send a request through the OSW address to the affected provider.
  5. Check Request Logs to confirm the provider accepted the request.

Prompt for your agent

Using the OSW repo at yinxulai/osw, create a request rewrite rule that <change> for the provider <provider-name>. Expected output: a saved rule and a successful request in Request Logs. Verify that the editor test case passes before saving.

Caveat. Rewrite rules change outgoing requests, so a wrong rule can cause a provider to reject every request it touches until the rule is fixed or removed.

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