Fix regression fetching file:// URI scheme in fetch() and XMLHttpRequest requests on Android (#54626) by bhamiltoncx · Pull Request #55706 · facebook/react-native

bhamiltoncx · 2026-02-23T22:26:20Z

Summary:

fetch() on file:// URIs is broken on RN Android, but works on RN iOS (#54626).

On Android, NetworkingModule powers the implementation of XMLHttpRequest, which is the implementation of fetch().

iOS's underlying implementation RCTNetworking uses RCTFileRequestHandler which correctly supports file:// URIs:

react-native/packages/react-native/Libraries/Network/RCTFileRequestHandler.mm

Line 44 in 56e1710

    
           return [request.URL.scheme caseInsensitiveCompare:@"file"] == NSOrderedSame && !RCTIsBundleAssetURL(request.URL);

Android's equivalent BlobModule works correctly to handle file:// URIs, but NetworkingModule was changed in #52485 to construct a okhttp3.Response, passing in an okhttp3.Request using the file:// URI.

Unfortunately, okhttp3.Request.Builder.url() throws InvalidArgumentException whenever given non-HTTP/HTTPS URLs, which caused #54626.

The fix is pretty simple: clean up the behavior changed in #52485 to just pass in the data needed (status code, headers, and content length) rather than trying to wrap it in an okhttp3.Response.

Changelog:

[ANDROID] [FIXED] - file:// URIs passed to fetch() or XMLHttpRequest no longer fail (#54626)

Test Plan

Unit tests updated. Ran tests with:

  ./gradlew :packages:react-native:ReactAndroid:testDebugUnitTest \
    --tests "com.facebook.react.modules.blob.BlobModuleTest" \
    --tests "com.facebook.react.modules.network.NetworkEventUtilTest" \
    --tests "com.facebook.react.modules.network.NetworkingModuleTest"

meta-cla · 2026-02-23T22:26:26Z

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…est requests (facebook#54626) On Android, `NetworkingModule` powers the implementation of `XMLHttpRequest`, which is the implementation of `fetch()`. iOS's underlying implementation `RCTNetworking` uses `RCTFileRequestHandler` which correctly supports `file://` URIs: https://github.com/facebook/react-native/blob/56e1710b73f0011516872bc6a62e52626588839c/packages/react-native/Libraries/Network/RCTFileRequestHandler.mm#L44 Android's equivalent `BlobModule` works correctly to handle `file://` URIs, but `NetworkingModule` was changed in facebook#52485 to construct a `okhttp3.Response`, passing in an `okhttp3.Request` using the `file://` URI. Unfortunately, `okhttp3.Request.Builder.url()` throws `InvalidArgumentException` whenever given non-HTTP/HTTPS URLs, which caused facebook#54626. The fix is pretty simple: clean up the behavior changed in facebook#52485 to just pass in the data needed (status code, headers, and content length) rather than trying to wrap it in an `okhttp3.Response`. Tested: ./gradlew :packages:react-native:ReactAndroid:testDebugUnitTest \ --tests "com.facebook.react.modules.blob.BlobModuleTest" \ --tests "com.facebook.react.modules.network.NetworkEventUtilTest" \ --tests "com.facebook.react.modules.network.NetworkingModuleTest"

bhamiltoncx · 2026-02-24T20:35:02Z

@huntie , apologies for the direct ping, but I haven't been at Meta in ages and I don't know how the GitHub -> Phabricator pipeline works these days. :)

Any thoughts on this PR? It fixes a gnarly regression from #52485 .

...act-native/ReactAndroid/src/main/java/com/facebook/react/modules/network/NetworkEventUtil.kt

huntie

Looks awesome, thanks. Will import and test.

meta-codesync · 2026-02-25T17:01:21Z

@huntie has imported this pull request. If you are a Meta employee, you can view this in D94377526.

Summary: Follows facebook#55706. Updates the signature of `onCreateRequest`, and removes legacy `onCreateRequest` and `onResponseReceived` overloads — effectively de-OkHttp-ing this internal API. Changelog: [Internal] Differential Revision: D94510863

react-native-bot · 2026-02-26T13:11:12Z

This pull request was successfully merged by @bhamiltoncx in e76a6e2

^{When will my fix make it into a release? | How to file a pick request?}

meta-codesync · 2026-02-26T13:11:13Z

@huntie merged this pull request in e76a6e2.

bhamiltoncx · 2026-02-26T13:16:53Z

Wonderful! Thanks for shepherding this fix along. I know it'll help a bunch of Android users.

Summary: Follows facebook#55706. Updates the signature of `onCreateRequest`, and removes legacy `onCreateRequest` and `onResponseReceived` overloads — effectively de-OkHttp-ing this internal API. Changelog: [Internal] Differential Revision: D94510863

Summary: Pull Request resolved: #55769 Follows #55706. Updates the signature of `onCreateRequest`, and removes legacy `onCreateRequest` and `onResponseReceived` overloads — effectively de-OkHttp-ing this internal API. Changelog: [Internal] Reviewed By: javache Differential Revision: D94510863 fbshipit-source-id: ce438af6e1cd352ce7afff5588621612e03f5cf9

bhamiltoncx changed the title ~~Fix regression fetching file:// URI scheme in fetch() and XMLHttpRequest requests (#54626)~~ Fix regression fetching file:// URI scheme in fetch() and XMLHttpRequest requests on Android (#54626) Feb 23, 2026

meta-cla bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Feb 23, 2026

bhamiltoncx force-pushed the issue-54626 branch from fc99fc2 to 07a3d92 Compare February 23, 2026 23:06

This was referenced Feb 23, 2026

React Native 0.82 Fetch Issues fetching local file #54626

Open

feat: Update createImageBitmap() to accept ArrayBuffer or Blob wcandillon/react-native-webgpu#318

Merged

facebook-github-bot added the Shared with Meta Applied via automation to indicate that an Issue or Pull Request has been shared with the team. label Feb 23, 2026

bhamiltoncx added 3 commits February 24, 2026 13:32

Add repro test to NetworkingModuleTest

6bc1dd3

Replace test introspection with internal visibility

b9d13be

bhamiltoncx force-pushed the issue-54626 branch from 07a3d92 to b9d13be Compare February 24, 2026 20:39

huntie reviewed Feb 25, 2026

View reviewed changes

...act-native/ReactAndroid/src/main/java/com/facebook/react/modules/network/NetworkEventUtil.kt Show resolved Hide resolved

bhamiltoncx mentioned this pull request Feb 25, 2026

Cleanup: Remove fbsource compatibility overload for NetworkEventUtil.onResponseReceived() #55747

Open

huntie approved these changes Feb 25, 2026

View reviewed changes

Restore fbsource compatibility overload

6267576

huntie mentioned this pull request Feb 26, 2026

Remove NetworkEventUtil compatibility overloads #55769

Closed

meta-codesync bot closed this in e76a6e2 Feb 26, 2026

facebook-github-bot added the Merged This PR has been merged. label Feb 26, 2026

react-native-bot added the Merged This PR has been merged. label Feb 26, 2026

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Fix regression fetching file:// URI scheme in fetch() and XMLHttpRequest requests on Android (#54626)#55706

Fix regression fetching file:// URI scheme in fetch() and XMLHttpRequest requests on Android (#54626)#55706
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