From d9b0f15c844abce5e97edfd401656d84d0c84133 Mon Sep 17 00:00:00 2001
From: jayshah <jshah@rippling.com>
Date: Fri, 1 Mar 2024 04:59:32 -0800
Subject: [PATCH] fix(iOS): add extended check for content
 typeapplication/javascript (#43262)

Summary:
When used with expo, JS code content type is `application/javascript; charset=UTF-8` instead of just `application/javascript`, We have a really large bundle and the application shows stuck at "Bundling 100%" and does not show "Downloading 1..100%".

Here we improve the check for the content type to correctly show the progress.

## Changelog:

[IOS] [FIXED] - Fixed headers content type check for iOS bundle download

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Pull Request resolved: https://github.com/facebook/react-native/pull/43262

Reviewed By: huntie

Differential Revision: D54412657

Pulled By: robhogan

fbshipit-source-id: f12e260f1bda36495eb5e6ecd0f66c86f26d4747
---
 packages/react-native/React/Base/RCTJavaScriptLoader.mm | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/react-native/React/Base/RCTJavaScriptLoader.mm b/packages/react-native/React/Base/RCTJavaScriptLoader.mm
index 5330bb4d470..5e8da828324 100755
--- a/packages/react-native/React/Base/RCTJavaScriptLoader.mm
+++ b/packages/react-native/React/Base/RCTJavaScriptLoader.mm
@@ -318,9 +318,11 @@ static void attemptAsynchronousLoadOfBundleAtURL(
         onComplete(nil, source);
       }
       progressHandler:^(NSDictionary *headers, NSNumber *loaded, NSNumber *total) {
+        NSString *contentType = headers[@"Content-Type"];
+        NSString *mimeType = [[contentType componentsSeparatedByString:@";"] firstObject];
         // Only care about download progress events for the javascript bundle part.
-        if ([headers[@"Content-Type"] isEqualToString:@"application/javascript"] ||
-            [headers[@"Content-Type"] isEqualToString:@"application/x-metro-bytecode-bundle"]) {
+        if ([mimeType isEqualToString:@"application/javascript"] ||
+            [mimeType isEqualToString:@"application/x-metro-bytecode-bundle"]) {
           onProgress(progressEventFromDownloadProgress(loaded, total));
         }
       }];