How to implement a reverse proxy
httputil has a method ‘NewSingleHostReverseProxy’ which returns a struct ‘ReverseProxy’. The ReverseProxy struct contains a Director field.
A director is a function where you tell the reverse proxy what to do with the incoming request.
In this sample code, I used itunes api.
main.go
func proxy(ctx *gin.Context) {
// declare a remote url for reverse proxy
remote, err := url.Parse("https://itunes.apple.com/search")
if err != nil {
panic(err)
}
// declare reverse ReverseProxy struct
proxy := httputil.NewSingleHostReverseProxy(remote)
// modify host, header with Director
proxy.Director = func(req *http.Request) {
req.Header = ctx.Request.Header
req.Host = remote.Host
req.URL.Scheme = remote.Scheme
req.URL.Host = remote.Host
req.URL.Path = ctx.Param("endpoint")
}
proxy.ServeHTTP(ctx.Writer, ctx.Request)
}
copied!
main.go
func main() {
g := gin.Default()
g.Any("/proxy/*endpoint", proxy)
g.Run(":8000")
}
copied!
In this example code, I coded all program above in main.go file. When I run these command below, I can start the program and get response correctly
go run main.go
curl "localhost:9000/proxy/search?term=chrvches&country=jp&artribute=artistName&limit=1"
copied!
