Support "catch all" http trigger route

Writing a route like {*path} and {**path} to get all subsequent path parameters did not correctly output the OpenAPI definition.

Microsoft.Azure.WebJobs.Extensions.OpenApi: 0.5.1-preview

Repro code

[FunctionName("CatchAll")]
[OpenApiOperation(operationId: "CatchAll", tags: new[] { "name" })]
[OpenApiParameter("path", In = ParameterLocation.Path, Type = typeof(string))]
[OpenApiResponseWithoutBody(HttpStatusCode.OK)]
public static ActionResult CatchAll([HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "catchall/{*path}")]
                                                 HttpRequest req,
                                                 string path)
{
    return new OkObjectResult(path);
}

Actual behavior

[shibayan]

@justinyoo

I tried the same route with the ASP.NET Core Web API with Swashbuckle, and it worked. Looking at the generated openapi definition, it seems that “*” should not be included in the definition.

[Route("api/[controller]")]
[ApiController]
public class ValuesController : ControllerBase
{
    [HttpGet("{*path}")]
    public ActionResult Get(string path)
    {
        return Ok(path);
    }
}

{
  "openapi": "3.0.1",
  "info": {
    "title": "WebApplication6",
    "version": "v1"
  },
  "paths": {
    "/api/Values/{path}": {
      "get": {
        "tags": [
          "Values"
        ],
        "parameters": [
          {
            "name": "path",
            "in": "path",
            "required": true,
            "schema": {
              "type": "string",
              "nullable": true
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Success"
          }
        }
      }
    }
  },
  "components": { }
}

[justinyoo]

@shibayan Yeah, it’s not something I can do on my end. If you Google it, there are so many discussions around - from the spec wise to the implementation perspective.

I’m not too sure, we can get it through the proxies.json file. Let me try.