Thingspeak.com yelling "getJSON request failed!"

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Isidor Pol 2021-4-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/803331-thingspeak-com-yelling-getjson-request-failed

评论： Andrew Clark 2021-4-23

采纳的回答： Vinod

在 MATLAB Online 中打开

Hello

I'm using site Thingspeak.com for storing data from my sensors.

Aprox 2 days ago it apear the error message:

I can not use any more: "getJSON request failed!"

$.getJSON('https://api.thingspeak.com/channels/'+channelNumber+'/feed.json?&amp;offset=0&amp;results=2500;key='+key, function(data)

It is not about cookies, because even in private windows I get same error.

Firefox in debug windows yelling:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://api.thingspeak.com/channels/795411/feed.json?&amp;offset=0&amp;results=2500;key=Z67C5TON0V5UU0M6. (Reason: CORS header 'Access-Control-Allow-Origin' missing).

My script worked till now, and I didn't change nothing on it. This errpr does not depent on browser.

What I need to change to be able to use again?

Thx

采纳的回答

Vinod 2021-4-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/803331-thingspeak-com-yelling-getjson-request-failed#answer_676256

The underlying issue has been fixed. A missing response header from the server caused your browser to not make any XHR requests.

Can you confirm your code is working again?

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Andrew Clark 2021-4-22

编辑：Andrew Clark 2021-4-23

在 MATLAB Online 中打开

Vinod, here is some minimal HTML code that shows the CORS error. I am using fetch which is the more modern replacement for XHR-type calls. This code has been working great until this week. If I execute the API call from the browser (or CURL) it succeeds, so I know the Thingspeak data is ok. And it fails using the regular jQuery "$.getJSON(" calls as well. Did Thingspeak somehow lose the "alllow CORS" in the response header? See https://stackoverflow.com/questions/67101121/no-access-control-allow-origin-thingspeak for more examples of this fail.

<html>
 <head>
 <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
    <title>BackpAQ Track Search</title>
    <meta name="author" content="Andrew Clark">
    
 </head>
 <body>
<script>
//var startDate = 
//var endDate = 
 var bpChannel = "1278482"; // public channel
 const unitsPM = "µg/m³";   
 
// fetch the (selected) data from ThingSpeak 
function loadData() {
  var result;
 // prototype: fetch('https://api.thingspeak.com/channels/1278482/feeds.json?api_key=xxxxxxxxxxxx&results=100' ,{
 fetch('https://api.thingspeak.com/channels/' + bpChannel + '/feed.json?results=2000&timezone=America%2FLos_Angeles', {
  method: 'GET', // or 'PUT'
  headers: {
    'Content-Type': 'application/json',
  },
})
.then(response => response.json())
.then(data => {
  console.log('Success:', data);
  var jParse = JSON.stringify(data, null, 2); // parse and pretty
   
 console.log(jParse);  
})
.catch((error) => {
  console.error('Error:', error);
}); 
}   // loadData
   
loadData(); // go fetch
</script>
 </body>   
</html>

Vinod 2021-4-23

Thanks for the HTML. I'm able to reproduce the issue with this. I believe in certain cases the required header is not being added at the server end. We'll look into this and provide resolution shortly.

Andrew Clark 2021-4-23

OK thanks!

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