diff --git a/lib/app.js b/lib/app.js
index 8685cc2..d55399d 100644
--- a/lib/app.js
+++ b/lib/app.js
@@ -46,8 +46,9 @@ app.get('/', function(req, res) {
     // do proxy
 
     // copy headers from the external request, but remove those that node should generate
-    var externalReqHeaders = u.omit(req.headers, 'accept-encoding', 'connection', 'cookie', 'host', 'user-agent');
-    externalReqHeaders.accept = 'application/json';
+    var externalReqHeaders = u.omit(req.headers, 'accept-encoding', 'connection', 'cookie', 'host', 'user-agent'),
+      raw = params.raw; // undocumented, for now
+    externalReqHeaders.accept = raw ? '*/*' : 'application/json';
 
     request({
       uri: apiUrl,
@@ -56,7 +57,6 @@ app.get('/', function(req, res) {
       encoding: 'utf8'
     }, function(error, response, body){
       var callbackName = params.callback || params.jsonp,
-        raw = params.raw, // undocumented, for now
         status;
 
       if (error){
diff --git a/test/server_test.js b/test/server_test.js
index a2a6dd3..20ae28a 100644
--- a/test/server_test.js
+++ b/test/server_test.js
@@ -145,4 +145,20 @@ describe('app', function(){
 
     });
   });
+
+  it('should set the Accept header to "*/*" for "raw" requests', function(done){
+    var destApp = express();
+    destApp.get('/', function(req, res){
+      expect(req.headers.accept).to.eql('*/*');
+      res.send('');
+    });
+    var server = http.createServer(destApp);
+    server.listen(8001, function(){
+
+      supertest(app)
+        .get('/')
+        .query({url: 'http://localhost:8001', raw: true})
+        .expect(200, done);
+    });
+  });
 });