net/http: add Handle example

Currently there is no example for http.Handle in the
documentation. This adds an example.

Change-Id: I66ee9983bea1f5237757e1ef4956eae9a056e963
Reviewed-on: https://go-review.googlesource.com/137715
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/net/http/example_handle_test.go b/src/net/http/example_handle_test.go
new file mode 100644 (file)
index 0000000..10a62f6
--- /dev/null
+++ b/src/net/http/example_handle_test.go
@@ -0,0 +1,29 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package http_test
+
+import (
+       "fmt"
+       "log"
+       "net/http"
+       "sync"
+)
+
+type countHandler struct {
+       mu sync.Mutex // guards n
+       n  int
+}
+
+func (h *countHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+       h.mu.Lock()
+       defer h.mu.Unlock()
+       h.n++
+       fmt.Fprintf(w, "count is %d\n", h.n)
+}
+
+func ExampleHandle() {
+       http.Handle("/count", new(countHandler))
+       log.Fatal(http.ListenAndServe(":8080", nil))
+}