Swagger: Unable to Infer Base URL - Solution and Explanation

The 'Unable to infer base url' error in Swagger typically occurs when using dynamic servlet registration or when your API is behind an API Gateway. The base URL is the root location from where all your Swagger resources are served. For example, if your API is accessible at 'http://example.org/api/v2/api-docs', then the base URL would be 'http://example.org/api/'.

To resolve this issue, you'll need to manually enter the base URL. Here's how you can do it:

1. Identify the Root Path: Determine the root path where your Swagger resources are hosted. This is usually the URL preceding the '/api-docs' endpoint.
2. Manual Configuration: In your Swagger configuration, provide the base URL explicitly. This might involve setting a property in your application code or modifying a configuration file.

Understanding the Importance of Base URL: The base URL is crucial for Swagger to correctly link and reference your API resources. Without it, Swagger won't be able to generate accurate documentation and navigation links.

Common Causes:

• Dynamic Servlet Registration: When servlets are dynamically registered, Swagger might not be able to automatically determine the base URL.
• API Gateway: API Gateways can introduce an extra layer of routing, making it challenging for Swagger to identify the base URL automatically.

Note: If you're still encountering problems after manual configuration, double-check that the provided base URL is correct and accessible by your Swagger application.