net/http/cgi: use 'https://' for urls if HTTPS is set.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/13700044

src/pkg/net/http/cgi/child.go

@@ -100,10 +100,21 @@ func RequestFromMap(params map[string]string) (*http.Request, error) {
 			uriStr += "?" + s
 		}
 	}
+
+	// There's apparently a de-facto standard for this.
+	// http://docstore.mik.ua/orelly/linux/cgi/ch03_02.htm#ch03-35636
+	if s := params["HTTPS"]; s == "on" || s == "ON" || s == "1" {
+		r.TLS = &tls.ConnectionState{HandshakeComplete: true}
+	}
+
 	if r.Host != "" {
-		// Hostname is provided, so we can reasonably construct a URL,
-		// even if we have to assume 'http' for the scheme.
-		rawurl := "http://" + r.Host + uriStr
+		// Hostname is provided, so we can reasonably construct a URL.
+		rawurl := r.Host + uriStr
+		if r.TLS == nil {
+			rawurl = "http://" + rawurl
+		} else {
+			rawurl = "https://" + rawurl
+		}
 		url, err := url.Parse(rawurl)
 		if err != nil {
 			return nil, errors.New("cgi: failed to parse host and REQUEST_URI into a URL: " + rawurl)
@@ -120,12 +131,6 @@ func RequestFromMap(params map[string]string) (*http.Request, error) {
 		r.URL = url
 	}
 
-	// There's apparently a de-facto standard for this.
-	// http://docstore.mik.ua/orelly/linux/cgi/ch03_02.htm#ch03-35636
-	if s := params["HTTPS"]; s == "on" || s == "ON" || s == "1" {
-		r.TLS = &tls.ConnectionState{HandshakeComplete: true}
-	}
-
 	// Request.RemoteAddr has its port set by Go's standard http
 	// server, so we do here too. We don't have one, though, so we
 	// use a dummy one.

src/pkg/net/http/cgi/child_test.go

@@ -21,7 +21,6 @@ func TestRequest(t *testing.T) {
 		"REQUEST_URI":     "/path?a=b",
 		"CONTENT_LENGTH":  "123",
 		"CONTENT_TYPE":    "text/xml",
-		"HTTPS":           "1",
 		"REMOTE_ADDR":     "5.6.7.8",
 	}
 	req, err := RequestFromMap(env)
@@ -58,14 +57,37 @@ func TestRequest(t *testing.T) {
 	if req.Trailer == nil {
 		t.Errorf("unexpected nil Trailer")
 	}
-	if req.TLS == nil {
-		t.Errorf("expected non-nil TLS")
+	if req.TLS != nil {
+		t.Errorf("expected nil TLS")
 	}
 	if e, g := "5.6.7.8:0", req.RemoteAddr; e != g {
 		t.Errorf("RemoteAddr: got %q; want %q", g, e)
 	}
 }
 
+func TestRequestWithTLS(t *testing.T) {
+	env := map[string]string{
+		"SERVER_PROTOCOL": "HTTP/1.1",
+		"REQUEST_METHOD":  "GET",
+		"HTTP_HOST":       "example.com",
+		"HTTP_REFERER":    "elsewhere",
+		"REQUEST_URI":     "/path?a=b",
+		"CONTENT_TYPE":    "text/xml",
+		"HTTPS":           "1",
+		"REMOTE_ADDR":     "5.6.7.8",
+	}
+	req, err := RequestFromMap(env)
+	if err != nil {
+		t.Fatalf("RequestFromMap: %v", err)
+	}
+	if g, e := req.URL.String(), "https://example.com/path?a=b"; e != g {
+		t.Errorf("expected URL %q; got %q", e, g)
+	}
+	if req.TLS == nil {
+		t.Errorf("expected non-nil TLS")
+	}
+}
+
 func TestRequestWithoutHost(t *testing.T) {
 	env := map[string]string{
 		"SERVER_PROTOCOL": "HTTP/1.1",