fetch() doing GET instead of POST on react-native (iOS)

Question

I have the following code in my component:

fetch('https://domain.com/api', {
  method: 'POST',
  headers: {'Accept': 'application/json', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    key: 'value'
  })
}).
  then((response) => {
    console.log('Done', response);
  });

And every time the request is a GET (checked server logs). I thought it was something to do with CORS (but apparently no such thing in react-native) and ATS (but already turned off by default, plus my domain is HTTPS). I've tried from a browser and from a curl and it worked perfectly, so a priori no issue on server configuration. Any idea what's going on here?

I'm using the latest react-native version.

hmm, have you done some tests using GET instead of POST? maybe the code in the phone is not updated yet with 'post' — Marco Acierno
– Marco Acierno, Commented Aug 11, 2016 at 16:12
GET works of course but it's a creation of resource, so POST is what I need. And I tried lowercase too, nothing works. I didn't mention it but I'm experiencing this issue on the simulator — mvdb
– mvdb, Commented Aug 12, 2016 at 1:57

mvdb · Accepted Answer · 2016-08-20 16:40:30Z

8

After further digging, it was definitely an issue with the API + fetch. I was missing a slash at the end of the URL and the API issued a 301, that fetch didn't handle correctly. So I don't know if there is something to fix in the fetch function (and underlying mechanisms) but this fixed my issue :)

answered Aug 20, 2016 at 16:40

mvdb

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1 Comment

Nathan Stowell Over a year ago

This was happening to me as well, however what was really weird is that it was only happening in a "release" build of my app deployed to a physical phone. Debug builds would POST correctly every time. Adding a trailing "/" to the route fixed the issue for me. Thanks for the help!

WiRa · Accepted Answer · 2018-03-14 15:36:45Z

6

When a POST is redirected (in my case from http to https) it gets transformed into a GET. (Don't know why...)

answered Mar 14, 2018 at 15:36

WiRa

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Comments

Flawn · Accepted Answer · 2025-09-26 08:53:14Z

0

Happened to me as well with React Router + Hono - as the other comments mentioned, this will be a weird redirection caused by a Cloudflare redirecting HTTP to HTTPS requests.

This was caused due to my deploy environment running in a local network in HTTP. When requesting my own API on the application-level, my application would use HTTP, which then was redirected via 302 to the HTTPS protocol but lost its method (per specification) and defaults to GET. Forcing a HTTPS there fixed the problem.

answered Sep 26 at 8:53

Flawn

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