React Native Post Request via Fetch throws Network Request Failed

Question

I´ve came across the following error. At the moment I developing an Android App with React Native therefore I´m planning to use fetch for doing a post request for me.

Answer 1

None of above answers were helped me. the problem was headers:

Old header:

fetch(API_HOST, {
                method: 'POST',
                headers: {
                    Accept: 'application/json'
                },
                body: JSON.stringify(data),

Updated header:

fetch(config.API_HOST, {
                method: 'POST',
                headers: {
                    Accept: 'application/json',
                    'Content-Type': 'application/json'  // I added this line
                },
                body: JSON.stringify(data),