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51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
// Writing a basic HTTP server is easy using the
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// `net/http` package.
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package main
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import (
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"fmt"
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"net/http"
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)
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// A fundamental concept in `net/http` servers is
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// *handlers*. A handler is an object implementing the
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// `http.Handler` interface. A common way to write
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// a handler is by using the `http.HandlerFunc` adapter
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// on functions with the appropriate signature.
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func hello(w http.ResponseWriter, req *http.Request) {
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// Functions serving as handlers take a
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// `http.ResponseWriter` and a `http.Request` as
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// arguments. The response writer is used to fill in the
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// HTTP response. Here our simple response is just
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// "hello\n".
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fmt.Fprintf(w, "hello\n")
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}
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func headers(w http.ResponseWriter, req *http.Request) {
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// This handler does something a little more
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// sophisticated by reading all the HTTP request
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// headers and echoing them into the response body.
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for name, headers := range req.Header {
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for _, h := range headers {
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fmt.Fprintf(w, "%v: %v\n", name, h)
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}
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}
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}
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func main() {
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// We register our handlers on server routes using the
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// `http.HandleFunc` convenience function. It sets up
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// the *default router* in the `net/http` package and
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// takes a function as an argument.
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http.HandleFunc("/hello", hello)
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http.HandleFunc("/headers", headers)
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// Finally, we call the `ListenAndServe` with the port
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// and a handler. `nil` tells it to use the default
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// router we've just set up.
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http.ListenAndServe(":8090", nil)
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}
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