From 3ae45d5cb8b9aaca568227ca00cc304e053bf073 Mon Sep 17 00:00:00 2001
From: Justin Reynolds <justinr1234@gmail.com>
Date: Tue, 19 Sep 2017 19:45:52 -0700
Subject: [PATCH] Fix Content-Type header checking of
 React/RCTJavascriptLoader.mm #15791

Summary:
To fix this issue: https://github.com/facebook/react-native/issues/15791
Closes https://github.com/facebook/react-native/pull/15792

Differential Revision: D5813101

Pulled By: shergin

fbshipit-source-id: fd3eb6f1d9ccdeb5373d1ba2b2df173ff7a8e986
---
 React/Base/RCTJavaScriptLoader.mm | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/React/Base/RCTJavaScriptLoader.mm b/React/Base/RCTJavaScriptLoader.mm
index 8fd439cb1..09fd6c089 100755
--- a/React/Base/RCTJavaScriptLoader.mm
+++ b/React/Base/RCTJavaScriptLoader.mm
@@ -284,16 +284,17 @@ static void attemptAsynchronousLoadOfBundleAtURL(NSURL *scriptURL, RCTSourceLoad
 
     // Validate that the packager actually returned javascript.
     NSString *contentType = headers[@"Content-Type"];
-    if (![contentType isEqualToString:@"application/javascript"] &&
-        ![contentType isEqualToString:@"text/javascript"]) {
-      NSString *description = [NSString stringWithFormat:@"Expected Content-Type to be 'application/javascript' or 'text/javascript', but got '%@'.", contentType];
+    NSString *mimeType = [[contentType componentsSeparatedByString:@";"] firstObject];
+    if (![mimeType isEqualToString:@"application/javascript"] &&
+        ![mimeType isEqualToString:@"text/javascript"]) {
+      NSString *description = [NSString stringWithFormat:@"Expected MIME-Type to be 'application/javascript' or 'text/javascript', but got '%@'.", mimeType];
       error = [NSError errorWithDomain:@"JSServer"
                                   code:NSURLErrorCannotParseResponse
                               userInfo:@{
                                          NSLocalizedDescriptionKey: description,
                                          @"headers": headers,
                                          @"data": data
-                                         }];
+                                       }];
       onComplete(error, nil);
       return;
     }