support responses endpoints as part of unified routes

[narengogi]

Author Description

! !

Support responses endpoints as part of unified routes

Description

🔄 What Changed

• Added support for OpenAI's model responses API endpoints
• Implemented new handler modelResponsesHandler.ts for processing response-related requests
• Added streaming functionality for model responses
• Added type definitions and helper functions for model responses
• Extended provider configurations for OpenAI and Azure OpenAI to support responses API

🔍 Impact of the Change

This change extends the gateway's capabilities to support the responses API, allowing clients to create, retrieve, delete, and list response input items through a unified interface. The implementation maintains compatibility with both OpenAI and Azure OpenAI providers.

📁 Total Files Changed

15 files were modified or added, including new handlers, type definitions, streaming support, and provider-specific implementations.

🧪 Test Added

N/A - No tests were added in this PR.

🔒 Security Vulnerabilities

No security vulnerabilities were identified. The implementation follows existing patterns for request validation and error handling.

Motivation

• Support for OpenAI's responses API endpoints provides a more complete implementation of the OpenAI API
• Enables applications to use the responses API through the gateway with both OpenAI and Azure OpenAI providers

Related Issues

N/A

Quality Recommendations

1. Add unit tests for the new model responses functionality to ensure proper handling of different response types and edge cases

2. Consider adding documentation comments to explain the purpose and usage of the new response endpoints

3. Implement error handling with more specific error messages in the modelResponsesHandler to provide better debugging information

4. Consider adding validation for the response parameters to ensure they meet the requirements of the underlying APIs

[VisargD]

/matter summary

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