support self define swagger.json mount url

[wanglihui]

Update swagger.go to support self define swagger.json mount url. now the default url is doc.json, and hard code switch case doc.json

[AntonDzyk]

@wanglihui hi! Object config.URL contains full URL address

[wanglihui]

@wanglihui hi! Object config.URL contains full URL address

i see defaultConfig.URL is "doc.json". i think that you expect developer to pass like "swagger.json" , not full URL.

[wanglihui]

@wanglihui hi! Object config.URL contains full URL address

i see defaultConfig.URL is "doc.json". i think that you expect developer to pass like "swagger.json" , not full URL.

and i think that set the default URL to "swagger.json" will be more better. since other framework's openapi mount url is swagger.json,thanks!

[ubogdan]

Is there any open issue for this PR ?

[ubogdan]

Any progress here?