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Hello world HTTP server example
source link: https://yourbasic.org/golang/http-server-example/
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Hello world HTTP server example
yourbasic.org/golang
A basic web server
If you access the URL http://localhost:8080/world
on a machine where the program below is running,
you will be greeted by this page.
package main
import (
"fmt"
"net/http"
)
func main() {
http.HandleFunc("/", HelloServer)
http.ListenAndServe(":8080", nil)
}
func HelloServer(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello, %s!", r.URL.Path[1:])
}
- The call to
http.HandleFunc
tells thenet.http
package to handle all requests to the web root with theHelloServer
function. - The call to
http.ListenAndServe
tells the server to listen on the TCP network address:8080
. This function blocks until the program is terminated. - Writing to an
http.ResponseWriter
sends data to the HTTP client. - An
http.Request
is a data structure that represents a client HTTP request. r.URL.Path
is the path component of the requested URL. In this case,"/world"
is the path component of"http://localhost:8080/world"
.
Further reading: a complete wiki
The Writing Web Applications tutorial shows how to extend this small example into a complete wiki.
The tutorial covers how to
- create a data structure with load and save methods,
- use the
net/http
package to build web applications, - use the
html/template
package to process HTML templates, - use the
regexp
package to validate user input.
More code examples
Go blueprints: code for common tasks is a collection of handy code examples.
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