详解React native fetch遇到的坑

fetch('https://mywebsite.com/endpoint/', {
 method: 'POST',
 headers: {
  'Accept': 'application/json',
  'Content-Type': 'application/json',
 },
 body: JSON.stringify({
  firstParam: 'yourValue',
  secondParam: 'yourOtherValue',
 })
})

fetch('https://mywebsite.com/endpoint/', {
 method: 'POST',
 headers: {
  'Content-Type': 'application/x-www-form-urlencoded',
 },
 body: 'key1=value1&key2=value2'
}

//获取sid
var headers = response.headers.get("set-cookie");
var header = headers.split(";");
var sessionid;
for(var index = 0; index < header.length; index++)
{
  if(header[index].indexOf("JSESSIONID") > -1){
    sessionid = header[index].split("=")[1];
  }
}
//保存
AsyncStorage.setItem('sessionid', sessionid);

fetch(Api.checkLoginSecurity , {
  credentials: 'include',
  method: 'POST',
  headers:{
    'Content-Type': 'application/x-www-form-urlencoded',
  },
  body: 'username='+ this.props.userName + '&password=' + this.userPassword
})

fetch(url , {
  credentials: 'include',
  method: 'GET',
})