Use http.Header instead of custom type (#1214)

* Use http.Header

* This initialization was just stupid

caddyhttp/header/header.go

@@ -26,15 +26,21 @@ func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error)
 	rww := &responseWriterWrapper{w: w}
 	for _, rule := range h.Rules {
 		if httpserver.Path(r.URL.Path).Matches(rule.Path) {
-			for _, header := range rule.Headers {
+			for name := range rule.Headers {
+
 				// One can either delete a header, add multiple values to a header, or simply
 				// set a header.
-				if strings.HasPrefix(header.Name, "-") {
-					rww.delHeader(strings.TrimLeft(header.Name, "-"))
-				} else if strings.HasPrefix(header.Name, "+") {
-					rww.Header().Add(strings.TrimLeft(header.Name, "+"), replacer.Replace(header.Value))
+
+				if strings.HasPrefix(name, "-") {
+					rww.delHeader(strings.TrimLeft(name, "-"))
+				} else if strings.HasPrefix(name, "+") {
+					for _, value := range rule.Headers[name] {
+						rww.Header().Add(strings.TrimLeft(name, "+"), replacer.Replace(value))
+					}
 				} else {
-					rww.Header().Set(header.Name, replacer.Replace(header.Value))
+					for _, value := range rule.Headers[name] {
+						rww.Header().Set(name, replacer.Replace(value))
+					}
 				}
 			}
 		}
@@ -44,16 +50,9 @@ func (h Headers) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error)
 
 type (
 	// Rule groups a slice of HTTP headers by a URL pattern.
-	// TODO: use http.Header type instead?
 	Rule struct {
 		Path    string
-		Headers []Header
-	}
-
-	// Header represents a single HTTP header, simply a name and value.
-	Header struct {
-		Name  string
-		Value string
+		Headers http.Header
 	}
 )
 

caddyhttp/header/header_test.go

@@ -37,11 +37,11 @@ func TestHeader(t *testing.T) {
 				return 0, nil
 			}),
 			Rules: []Rule{
-				{Path: "/a", Headers: []Header{
-					{Name: "Foo", Value: "Bar"},
-					{Name: "ServerName", Value: "{hostname}"},
-					{Name: "-Bar"},
-					{Name: "-Server"},
+				{Path: "/a", Headers: http.Header{
+					"Foo":        []string{"Bar"},
+					"ServerName": []string{"{hostname}"},
+					"-Bar":       []string{""},
+					"-Server":    []string{},
 				}},
 			},
 		}
@@ -71,9 +71,8 @@ func TestMultipleHeaders(t *testing.T) {
 			return 0, nil
 		}),
 		Rules: []Rule{
-			{Path: "/a", Headers: []Header{
-				{Name: "+Link", Value: "</images/image.png>; rel=preload"},
-				{Name: "+Link", Value: "</css/main.css>; rel=preload"},
+			{Path: "/a", Headers: http.Header{
+				"+Link": []string{"</images/image.png>; rel=preload", "</css/main.css>; rel=preload"},
 			}},
 		},
 	}

caddyhttp/header/setup.go

@@ -1,6 +1,8 @@
 package header
 
 import (
+	"net/http"
+
 	"github.com/mholt/caddy"
 	"github.com/mholt/caddy/caddyhttp/httpserver"
 )
@@ -31,6 +33,7 @@ func headersParse(c *caddy.Controller) ([]Rule, error) {
 
 	for c.NextLine() {
 		var head Rule
+		head.Headers = http.Header{}
 		var isNewPattern bool
 
 		if !c.NextArg() {
@@ -54,27 +57,26 @@ func headersParse(c *caddy.Controller) ([]Rule, error) {
 
 		for c.NextBlock() {
 			// A block of headers was opened...
-
-			h := Header{Name: c.Val()}
+			name := c.Val()
+			value := ""
 
 			if c.NextArg() {
-				h.Value = c.Val()
+				value = c.Val()
 			}
 
-			head.Headers = append(head.Headers, h)
+			head.Headers.Add(name, value)
 		}
 		if c.NextArg() {
 			// ... or single header was defined as an argument instead.
 
-			h := Header{Name: c.Val()}
-
-			h.Value = c.Val()
+			name := c.Val()
+			value := c.Val()
 
 			if c.NextArg() {
-				h.Value = c.Val()
+				value = c.Val()
 			}
 
-			head.Headers = append(head.Headers, h)
+			head.Headers.Add(name, value)
 		}
 
 		if isNewPattern {

caddyhttp/header/setup_test.go

@@ -2,6 +2,8 @@ package header
 
 import (
 	"fmt"
+	"net/http"
+	"reflect"
 	"testing"
 
 	"github.com/mholt/caddy"
@@ -39,15 +41,15 @@ func TestHeadersParse(t *testing.T) {
 	}{
 		{`header /foo Foo "Bar Baz"`,
 			false, []Rule{
-				{Path: "/foo", Headers: []Header{
-					{Name: "Foo", Value: "Bar Baz"},
+				{Path: "/foo", Headers: http.Header{
+					"Foo": []string{"Bar Baz"},
 				}},
 			}},
 		{`header /bar { Foo "Bar Baz" Baz Qux }`,
 			false, []Rule{
-				{Path: "/bar", Headers: []Header{
-					{Name: "Foo", Value: "Bar Baz"},
-					{Name: "Baz", Value: "Qux"},
+				{Path: "/bar", Headers: http.Header{
+					"Foo": []string{"Bar Baz"},
+					"Baz": []string{"Qux"},
 				}},
 			}},
 	}
@@ -77,7 +79,7 @@ func TestHeadersParse(t *testing.T) {
 			expectedHeaders := fmt.Sprintf("%v", expectedRule.Headers)
 			actualHeaders := fmt.Sprintf("%v", actualRule.Headers)
 
-			if actualHeaders != expectedHeaders {
+			if !reflect.DeepEqual(actualRule.Headers, expectedRule.Headers) {
 				t.Errorf("Test %d, rule %d: Expected headers %s, but got %s",
 					i, j, expectedHeaders, actualHeaders)
 			}