浏览器显示先前的响应

I run the code

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", sroot)
    http.ListenAndServe(":8080", nil)
}

func sroot(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Welcome")
}

and browser showed a response as expected: Welcome then, after some time I try to change the output but have found that the output does not change! so, when I change the output fmt.Fprintf(w, "Welcome 123") but browser still ouptuts Welcome.

So what's the magic happens here?

You can use gin to reload your webserver.

Installation: go get github.com/codegangsta/gin

Usage: gin run filename.go

Reference: https://github.com/codegangsta/gin

By default the browser makes a GET request when navigating to the page. The browser is also going to make some decisions about the 'cachability' of the page: Has the url changed? Has the querystring changed? Has the ETAG changed? If none of these are true, the browser is most likely serving a cached version of the page.