How to Build a Simple Web Server with Golang?
Golang is a procedural programming language ideal to build simple, reliable, and efficient software.
Creating Web Servers Using Golang:
Initialize a project
Create a project folder with a .go file inside eg. server.go.
Directory structure:
The server.go file:
Go
package mainimport ( "fmt" "log" "net/http")func main() { // API routes http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hello world from GfG") }) http.HandleFunc("/hi", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hi") }) port := ":5000" fmt.Println("Server is running on port" + port) // Start server on port specified above log.Fatal(http.ListenAndServe(port, nil))} |
Run the server using the following command (make sure you’re in the project directory):
go run server.go
Note: You have to stop the server with Ctrl + C and restart via the same command whenever the server.go file is changed.
Console:
Open the desired web browser and any of these URLs to verify if the server is running:
http://localhost:5000/ or http://localhost:5000/hi
Output:
Serving static files:
Create a static folder with all the static files.
Example directory structure:
Example static files:
- The GfG logo
- The index.html file
HTML
<html> <head> <title>Home</title> </head> <body> <h2>Home page</h2> </body></html> |
- The about.html file
HTML
<html> <head> <title>About</title> </head> <body> <h2>about page!</h2> </body></html> |
Now Edit the server.go file:
Go
package mainimport ( "fmt" "log" "net/http")func main() { // API routes // Serve files from static folder http.Handle("/", http.FileServer(http.Dir("./static"))) // Serve api /hi http.HandleFunc("/hi", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hi") }) port := ":5000" fmt.Println("Server is running on port" + port) // Start server on port specified above log.Fatal(http.ListenAndServe(port, nil))} |
Verifying if static files are served:
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