Allow response header value to contain a colon

HTTP response header field values are allowed to contain separators
(which includes the colon) as long as they appear within quotes
(http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2). This
commit enables `Browser#response_headers` to handle a field value that
contains a colon followed by a space (i.e., ": ") without breaking.

lib/capybara/webkit/browser.rb

@@ -71,7 +71,7 @@ module Capybara::Webkit
     end
 
     def response_headers
-      Hash[command("Headers").split("\n").map { |header| header.split(": ") }]
+      JSON.parse(command("Headers"))
     end
 
     def current_url

spec/driver_spec.rb

@@ -2974,6 +2974,24 @@ CACHE MANIFEST
     end
   end
 
+  context "response header contains colon" do
+    let(:driver) do
+      driver_for_app do
+        get "/" do
+          headers "Content-Disposition" => 'filename="File: name.txt"'
+        end
+      end
+    end
+
+    it "sets the response header" do
+      visit("/")
+
+      expect(
+        driver.response_headers["Content-Disposition"]
+      ).to eq 'filename="File: name.txt"'
+    end
+  end
+
   def driver_url(driver, path)
     URI.parse(driver.current_url).merge(path).to_s
   end

src/Headers.cpp

@@ -1,11 +1,14 @@
 #include "Headers.h"
 #include "WebPage.h"
 #include "WebPageManager.h"
+#include "JsonSerializer.h"
 
 Headers::Headers(WebPageManager *manager, QStringList &arguments, QObject *parent) : SocketCommand(manager, arguments, parent) {
 }
 
 void Headers::start() {
-  finish(true, page()->pageHeaders().join("\n"));
+  JsonSerializer serializer;
+  QByteArray json = serializer.serialize(page()->pageHeaders());
+  finish(true, json);
 }
 

src/WebPage.cpp

@@ -83,9 +83,9 @@ void WebPage::setFrameProperties(QWebFrame *frame, QUrl &requestedUrl, NetworkRe
   if (frame->requestedUrl() == requestedUrl) {
     int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
     frame->setProperty("statusCode", statusCode);
-    QStringList headers;
+    QVariantMap headers;
     foreach(QNetworkReply::RawHeaderPair header, reply->rawHeaderPairs())
-      headers << header.first+": "+header.second;
+      headers[header.first] = QString(header.second);
     frame->setProperty("headers", headers);
     frame->setProperty("body", reply->data());
     QVariant contentMimeType = reply->header(QNetworkRequest::ContentTypeHeader);
@@ -359,8 +359,8 @@ int WebPage::getLastStatus() {
   return currentFrame()->property("statusCode").toInt();
 }
 
-QStringList WebPage::pageHeaders() {
+QVariantMap WebPage::pageHeaders() {
-  return currentFrame()->property("headers").toStringList();
+  return currentFrame()->property("headers").toMap();
 }
 
 QByteArray WebPage::body() {

src/WebPage.h

@@ -47,7 +47,7 @@ class WebPage : public QWebPage {
     bool matchesWindowSelector(QString);
     void setFocus();
     void unsupportedContentFinishedReply(QNetworkReply *reply);
-    QStringList pageHeaders();
+    QVariantMap pageHeaders();
     QByteArray body();
     QString contentType();
     void mouseEvent(QEvent::Type type, const QPoint &position, Qt::MouseButton button);