What about ajax cross-domain access error 501?
Editor to share with you about ajax cross-domain access error 501 how to do, I believe that most people do not understand, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!
Problem: ajax cross-domain access error 501
Running the following code will report an error 501
Ajax ({type: "POST", url: "http://192.168.1.202/sensordata.php", contentType:'application/json; charset=utf-8', data: JSON.stringify (ajaxPostData), dataType:'json', success: function (data) {/ / On ajax success do this console.info (" success. "); if (data [" status "] =" ok ") {alert (" Settings is Ok. The Machine is rebooting. ");}}, error: function (xhr, ajaxOptions, thrownError) {/ / On error do this console.info (" error. "); if (xhr.status = = 200) {alert (ajaxOptions);} else {alert (xhr.status); alert (thrownError);})
Solution:
Get rid of contentType:'application/json; charset=utf-8'
Reason:
1 when crossing a domain, the browser will be triggered to send a request with the method OPTIONS first, except that the contentType is application/x-www-form-urlencoded, multipart/form-data or text/plain.
2 for example, your original request is the method method POST, if the Allow attribute in the result Header returned by the first request does not have a POST method
3 then the second request will not be sent, and the browser console will report an error, telling you that the POST method is not supported by the server.
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