[ENHANCEMENT] Show URL for 404 Connection Issues

[Vaccano]

Problem (one or two sentences)

While struggling to get Roo Code to connect to my Azure AI model, it is very frustrating to only see 404 as the error. The failing URL would make troubleshooting MUCH easier.

Context (who is affected and when)

When I am connecting to my Azure hosted AI Models, there are a lot of different options to try out to get it working. As each one fails, the messages are not enough to see what is going wrong.

Desired behavior (conceptual, not technical)

Surface the failed URL somewhere. I checked the:

• Logs (that I could find)
• Output window (Roo Code section), with and without Roo Code's Debug Mode turned on.
• Visual Studio Code's Network tab in the debug tools

I could not find the failed URL anywhere. Please make this visable.

(As a side note, it would also be nice for some docs around how to connect using urls like this: https://westus.api.cognitive.microsoft.com)

Constraints / preferences (optional)

No response

Request checklist

• I've searched existing Issues and Discussions for duplicates
• This describes a specific problem with clear context and impact

Roo Code Task Links (optional)

No response

Acceptance criteria (optional)

Given that a user has selected Open AI (or something similar) as their provider
When the URL provided as the base is not successful (because of a 404 error, or similar)
Then the URL should showup in the UI in a place that is discoverable by a normal user

Proposed approach (optional)

Show the failed URL in the Output tab.

Trade-offs / risks (optional)

No response

[roomote]

Proposed Implementation Plan

After exploring the codebase, I have identified the following approach to surface failed URLs in connection errors:

Problem Analysis

Currently, when API connection errors occur (like 404), the error message shows the status code but not the URL that failed. The URL information is available in the provider classes (e.g., baseURL in src/api/providers/openai.ts line 40) but is not passed through the error handling chain.

Proposed Changes

1. Modify handleProviderError in src/api/providers/utils/error-handler.ts

• Add an optional url parameter to the options object
• When a URL is provided and the error is a connection error (4xx/5xx), include the URL in the error message
• Log the full URL to the Output Channel for additional discoverability

2. Update provider error handling calls

• Modify providers to pass their baseURL to handleProviderError
• Affected files:
  • src/api/providers/openai.ts (handles Azure OpenAI, Azure AI Inference)
  • src/api/providers/base-openai-compatible-provider.ts
  • Other OpenAI-compatible providers as needed

3. Error Message Format
The enhanced error message would look like:

API Error 404: Resource not found
URL: https://your-resource.openai.azure.com/openai/deployments/model-name/...

Files to Modify

1. src/api/providers/utils/error-handler.ts - Add URL handling to error messages
2. src/api/providers/openai.ts - Pass baseURL to error handler
3. src/api/providers/base-openai-compatible-provider.ts - Pass baseURL to error handler
4. Related test files for coverage

Questions

1. Should the URL be shown in the chat UI error message, the Output Channel, or both?
2. Should we mask any sensitive parts of the URL (like API keys that might be in query params)?

Please let me know if this approach looks good or if you have any feedback!