From 9b3c743f827e4eeacc0e85dc0d88e7b252445bec Mon Sep 17 00:00:00 2001
From: Andrew Gerrand <adg@golang.org>
Date: Tue, 8 Jun 2010 01:28:40 +0200
Subject: [PATCH] http: add Head function for making HTTP HEAD requests

R=rsc
CC=golang-dev
https://golang.org/cl/1581041
---
 src/pkg/http/client.go      | 14 +++++++++++++-
 src/pkg/http/client_test.go | 10 ++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/pkg/http/client.go b/src/pkg/http/client.go
index fe61d207332..54487dac2f9 100644
--- a/src/pkg/http/client.go
+++ b/src/pkg/http/client.go
@@ -130,7 +130,6 @@ func Get(url string) (r *Response, finalURL string, err os.Error) {
 	return
 }
 
-
 // Post issues a POST to the specified URL.
 //
 // Caller should close r.Body when done reading it.
@@ -154,6 +153,19 @@ func Post(url string, bodyType string, body io.Reader) (r *Response, err os.Erro
 	return send(&req)
 }
 
+// Head issues a HEAD to the specified URL.
+func Head(url string) (r *Response, err os.Error) {
+	var req Request
+	req.Method = "HEAD"
+	if req.URL, err = ParseURL(url); err != nil {
+		return
+	}
+	if r, err = send(&req); err != nil {
+		return
+	}
+	return
+}
+
 type nopCloser struct {
 	io.Reader
 }
diff --git a/src/pkg/http/client_test.go b/src/pkg/http/client_test.go
index 6787825d81f..a916b12e240 100644
--- a/src/pkg/http/client_test.go
+++ b/src/pkg/http/client_test.go
@@ -28,3 +28,13 @@ func TestClient(t *testing.T) {
 		t.Errorf("Incorrect page body (did not begin with User-agent): %q", s)
 	}
 }
+
+func TestClientHead(t *testing.T) {
+	r, err := Head("http://www.google.com/robots.txt")
+	if err != nil {
+		t.Error(err)
+	}
+	if _, ok := r.Header["Last-Modified"]; !ok {
+		t.Error("Last-Modified header not found.")
+	}
+}