Omitting host returns Internal Server Error (500)

[akshay196]

Describe the bug
When I omit host field in a Gin based application and try to access API documentation using localhost:5000/swagger/index.html I get Fetch error Internal Server Error doc.json. Screenshot attached.

Received 500 in the application log:

[GIN] 2021/10/07 - 13:20:11 | 500 |        9.59µs |       127.0.0.1 | GET      "/swagger/doc.json"

As per the Swagger 2.0 specification, host and schemes can be omitted for a more dynamic association. In this case, the host and scheme used to serve the API documentation will be used for API calls. (reference)

To Reproduce
Steps to reproduce the behavior:

1. Develop Gin application with no host specified.

// @title App
// @version 0.1
// @description application description

// @BasePath /

// @securityDefinitions.apikey Token
// @in header
// @name Authorization
func main() {
	app := gin.Default()
        //...
}

2. Run swag init
3. Then run your application
4. Visit localhost:5000/swagger/index.html (application is running at localhost:5000)
5. See error in browser

Expected behavior
The API documentation should not return 500. The host and scheme used to serve the API documentation will be used for API calls.

Screenshots

Your swag version
v1.7.3

Your go version
1.16.5

Desktop (please complete the following information):

• OS: Linux/Fedora
• Browser: Firefox
• Version:

[akshay196]

This comment solved this issue.

[volkansolak]

Hi, i am having this problem too. How did you analyze it?

[Sadakhatali]

Hi, I am also facing same problem, while accessing the swagger I am facing same error like above

[samozturk]

You need to import docs package in your main package.
docs package is created by swagger when you swag init.

[beijJxy]

You need to import docs package in your main package. docs package is created by swagger when you swag init.

Thank you so much

[Anorboyev-Xayrullo]

You need to import docs package in your main package.
docs package is created by swagger when you swag init.