Hello,

For a simple spec like this one:

  /resource/{param}:
    get:
      operationId: getMaxLengthResourceParameter
      parameters:
        - name: param
          in: path
          required: true
          schema:
            type: string
            maxLength: 1
      responses:
        "204":
          description: success

and an HTTP request to /resource/%2B, the validation fails, although it should not. It fails because parameters are given in their encoded form to openapi3filter. In this case, it passes %2B for validation, and because it is longer than 1, it fails.

It should pass + to openapi3filter.

This is because route, pathParams, err := router.FindRoute(req) returns encoded pathParams. It does so because gorillamux.NewRouter(swagger) uses mux.NewRouter().UseEncodedPath() itself.

I am working on a PR fixing this.