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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.

The above is all the contents of the article "what to do about ajax cross-domain access error 501". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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