HTTP servers sample

examples/http-servers/http-servers.go

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

examples/http-servers/http-servers.hash

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+1bffba1944537a9f9d7166a67d7a2b9f4ce2d70e
+hg47WDVcY_W

examples/http-servers/http-servers.sh

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+# Run the server in the background.
+$ go run examples/http-servers/http-servers.go &
+
+# Access the `/hello` route.
+$ curl localhost:8090/hello
+hello