fetch doesnt't work properly in deployed ios application

Expo SDK
1

Please provide the following:

  1. SDK Version: 35
  2. Platforms(Android/iOS/web/all): ios

I use ‘fetch’ to connect to the backend of my service via https. It works very well in simulator, but when I release it in production only 1 of 10 requests arrive to my backend (I have nginx before my backend and I read access.logs so I am totally confident in my backend).
I use fetch this way:

 async _apiGetJson(handler) {
    responseJson = {}
    url = this.api_url + handler
    headers = {}

    try {
      headers = {
        'Content-Type': 'application/json',
        'X-Api-Key': this.api_key,
        'X-User-Id': this.user_id,
        'X-Language': this.language,
        'X-User-Agent': this._userAgent(),
      }

      let response = await fetch(url, {
        method: 'GET',
        headers: headers,
      });
      
      responseBody = await response.text();
      console.log('Backend.js : http GET request:', url, 'response code:', response.status, 'body:', responseBody);

      if (response.status != 200) {
        throw(new Error(responseBody));
      }

      responseJson = JSON.parse(responseBody);

    } catch (error) {
      console.error('ERROR: Backend.js: fetching api ' + url + ', headers:' + headers + ' : ' + error);
      throw(error);
    }

    return responseJson
  }

So why the ios production application connects to my backend only 1 of 10 times?

2

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