Fetch takes so much time to start

[msafayasar]

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Environment

Environment:
OS: macOS High Sierra 10.13.6
Node: 8.9.1
Yarn: 1.3.2
npm: 5.5.1
Watchman: 4.9.0
Xcode: Xcode 9.4.1 Build version 9F2000
Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed)
react: 16.3.1 => 16.3.1
react-native: ^0.55.4 => 0.55.4

Description

In both on Android (emulator and device) and IOS (simulator and device) sometimes fetch request does not start immediately. Most of the time I need to wait for 10-60 secs in order to start fetch. It happens at all of the fetch requests all over the app. I wrote a middleware to inform me when a request comes and most of the time it is about 10-60 seconds. But sometimes it works immediately. I am sure my server side code is not that slow. I tested it. But I cannot understand this behavior of fetch. Also my website is https, not http.

On the other hand, it happens more on Android than IOS. I think there is some kind of bug in fetch or maybe there is a conflict in node modules.

Reproducible Demo

I am not sure if we can reproduce this issue but I googled it for over 2 weeks and I nearly read all posts, comments about fetch in github and stackoverflow. I couldn't find any solution for it. Thus, I think there is some kind of bug or maybe there is a conflict in node modules but I am not sure.

[react-native-bot]

Can you reproduce the issue on the latest release, v0.56?

[franzejr]

@msafayasar maybe if you create a simple example that it happens sometimes other person could try to reproduce it too ? I've been using fetch and I'm not seeing this issue.

[msafayasar]

Actually I am facing the same problem with #20405

Maybe not the same because @john-hu says that it never resolves. In my case it resolves but sometimes immediately, sometimes takes about 60 seconds and more

[react-native-bot]

I am closing this issue because it does not appear to have been verified on the latest release, and there has been no followup in a while.

If you found this thread after encountering the same issue in the latest release, please feel free to create a new issue with up-to-date information by clicking here.