My domain is blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
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Since this week I cannot add a talkback command using Javascript/Ajax. I get the following error in my web browser (Chrome)
Access to XMLHttpRequest at 'https://api.thingspeak.com/talkbacks/32490/commands.json?apikey=xxxxxxxxxxxxxxx&command_string=OFF&position=1'
from origin 'https://desmon.fr' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
However the same code was working perfectly 2 weeks ago. It seems that my website is blocked on ThingSpeak.
When I try to submit the same command using CUIRL it works (from my PC).
curl -X POST https://api.thingspeak.com/talkbacks/32490/commands.json?api_key=xxxxxxxxxxxxxxxxxx -d "command_string=ON&position=1"
Here is the Javascript code I use:
$.ajax({
type: 'POST',
url: 'https://api.thingspeak.com/talkbacks/32490/commands.json?apikey=xxxxxxxxxxxxxxxxxxxxxxx&command_string='+newState+'&position=1',
crossDomain : true,
success: function(data) {
2 Comments
Vinod
on 21 Oct 2019
Edited: Vinod
on 21 Oct 2019
Can you tell us more about the use case -- why is the web browser posting commands to talkbacks?
Talkbacks are primarily intended for use by devices. The CORS policy we have prevents this use from a web browser which does some additional validation on the client side when making the requests. We can look into putting in headers to prevent the browser from doing these checks depending on the use case.
Accepted Answer
Vinod
on 23 Oct 2019
On further investigation, it appears that there is a difference between your AJAX code and the CURL command:
AJAX request is:
https://api.thingspeak.com/talkbacks/32490/commands.json?apikey=xxxxxxxxxxxxxxx&command_string=OFF&position=1
CURL request is
https://api.thingspeak.com/talkbacks/32490/commands.json?api_key=xxxxxxxxxxxxxxxxxx -d "command_string=ON&position=1
Note the difference "apikey" v/s "api_key".
Can you please modify your AJAX request to use api_key and try again?
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