RCN Fetch failure: cannot parse response

[komal-lathiya]

Description

11.11.0 - [FirebaseRemoteConfig][I-RCN000026] RCN Fetch failure: Error Domain=NSURLErrorDomain Code=-1017 "cannot parse response"

I have implemented Firebase Remote configuration in my project. It was working fine but, suddendly it was stop working in iPhone simulator. I got the below logs in my console.

11.11.0 - [FirebaseRemoteConfig][I-RCN000026] RCN Fetch failure: Error Domain=NSURLErrorDomain Code=-1017 "cannot parse response" UserInfo={_kCFStreamErrorCodeKey=-1, NSUnderlyingError=0x600000c8fcc0 {Error Domain=kCFErrorDomainCFNetwork Code=-1017 "(null)" UserInfo={NSErrorPeerAddressKey=<CFData 0x6000026356e0 [0x1e6ebb4f0]>{length = 28, capacity = 28, bytes = 0x1c1e01bb000000002404680040090827 ... 0000200a00000000}, _kCFStreamErrorCodeKey=-1, _kCFStreamErrorDomainKey=4}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <75FD4372-12F3-4F23-B6C0-49509335D1FC>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=( "LocalDataTask <75FD4372-12F3-4F23-B6C0-49509335D1FC>.<1>" ), NSLocalizedDescription=cannot parse response, NSErrorFailingURLStringKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, NSErrorFailingURLKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, _kCFStreamErrorDomainKey=4}. No cached config result. 11.11.0 - [FirebaseRemoteConfig][I-RCN000026] RCN Fetch failure. Response http error code: 0

What I have tried

Try Different versions of simulators, Clear Simulator data, Try diffrent models of Simulator
Checked my Internet connection, and it was good
Working fine with real devices

Reproducing the issue

Integrate Firebase Remote config using SPM & run in iOS Simulator.

Firebase SDK Version

11.11.0

Xcode Version

16.3

Installation Method

Swift Package Manager

Firebase Product(s)

Remote Config

Targeted Platforms

iOS

Relevant Log Output

Task <AD459EB7-46E3-416F-B8DB-390046165497>.<2> finished with error [-1005] Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost." UserInfo={_kCFStreamErrorCodeKey=-4, NSUnderlyingError=0x600000d0a880 {Error Domain=kCFErrorDomainCFNetwork Code=-1005 "(null)" UserInfo={NSErrorPeerAddressKey=<CFData 0x6000026821c0 [0x1139001d0]>{length = 28, capacity = 28, bytes = 0x1c1e01bb000000002404680040090822 ... 0000200a00000000}, _kCFStreamErrorCodeKey=-4, _kCFStreamErrorDomainKey=4}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <AD459EB7-46E3-416F-B8DB-390046165497>.<2>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <AD459EB7-46E3-416F-B8DB-390046165497>.<2>"
), NSLocalizedDescription=The network connection was lost., NSErrorFailingURLStringKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, NSErrorFailingURLKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, _kCFStreamErrorDomainKey=4}

Error: The network connection was lost.

Task <75FD4372-12F3-4F23-B6C0-49509335D1FC>.<1> finished with error [-1017] Error Domain=NSURLErrorDomain Code=-1017 "cannot parse response" UserInfo={_kCFStreamErrorCodeKey=-1, NSUnderlyingError=0x600000c8fcc0 {Error Domain=kCFErrorDomainCFNetwork Code=-1017 "(null)" UserInfo={NSErrorPeerAddressKey=<CFData 0x6000026356e0 [0x1e6ebb4f0]>{length = 28, capacity = 28, bytes = 0x1c1e01bb000000002404680040090827 ... 0000200a00000000}, _kCFStreamErrorCodeKey=-1, _kCFStreamErrorDomainKey=4}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <75FD4372-12F3-4F23-B6C0-49509335D1FC>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <75FD4372-12F3-4F23-B6C0-49509335D1FC>.<1>"
), NSLocalizedDescription=cannot parse response, NSErrorFailingURLStringKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, NSErrorFailingURLKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, _kCFStreamErrorDomainKey=4}

11.11.0 - [FirebaseRemoteConfig][I-RCN000026] RCN Fetch failure: Error Domain=NSURLErrorDomain Code=-1017 "cannot parse response" UserInfo={_kCFStreamErrorCodeKey=-1, NSUnderlyingError=0x600000c8fcc0 {Error Domain=kCFErrorDomainCFNetwork Code=-1017 "(null)" UserInfo={NSErrorPeerAddressKey=<CFData 0x6000026356e0 [0x1e6ebb4f0]>{length = 28, capacity = 28, bytes = 0x1c1e01bb000000002404680040090827 ... 0000200a00000000}, _kCFStreamErrorCodeKey=-1, _kCFStreamErrorDomainKey=4}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <75FD4372-12F3-4F23-B6C0-49509335D1FC>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <75FD4372-12F3-4F23-B6C0-49509335D1FC>.<1>"
), NSLocalizedDescription=cannot parse response, NSErrorFailingURLStringKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, NSErrorFailingURLKey=https://firebaseremoteconfig.googleapis.com/v1/projects/[projname]-88a56/namespaces/firebase:fetch?key=AIzaSyBnHsFa3O_kKPZP9FubXVLpm40YeWb0r6E, _kCFStreamErrorDomainKey=4}. No cached config result.
11.11.0 - [FirebaseRemoteConfig][I-RCN000026] RCN Fetch failure. Response http error code: 0

Error: cannot parse response

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If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

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[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[rizafran]

Hi @komal-lathiya, I tried to reproduce but I'm unable to get the same issue. Have you tried connecting to different network?

[stephenheron]

We are seeing some similar issues this is happening in production on iOS only. Android seems fine. This is potentially a critical issue?

[paulb777]

It's possible that this is related to a bug in the iOS 18.4 simulator. Does it help to use an older simulator? See #14677 (comment)

[komal-lathiya]

This is a critical issue. I have tried different networks and different versions of simulators, and I have also tried erasing all data from the simulator, but nothing works.

[cap-vinaynaikade]

We’re encountering the same issue on iOS devices, but it does not occur on simulators running iOS versions earlier than 18.4.

[kupresk14]

FYI I do not think this is secluded to just simulators. However to reproduce open a different iPhone simulator type each run, it will trigger it more often than not on 18.4 simulators