Using HTTP POST in a Firefox Extension using JavaScript

Question

As a beginner, I am attempting to execute a basic HTTP post in JS using a Firefox extension.

I'm encountering an issue where the parameters are not being passed as expected:

var params = "a=1&b=2&c=3"
req.open('POST', 'http://www.mywebsite.com/');
req.send(params);

If you have any insights on what could be causing this problem, I would greatly appreciate your assistance. Thank you.

Answer 1

Answer №1

Ensure that you have included the appropriate header to inform the server of the type of request body being sent:

req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

(Assuming req refers to an instance of XMLHttpRequest instantiated earlier in the script.)

Answer 2

Ensure that you have included the appropriate header to inform the server of the type of request body being sent:

req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

(Assuming req refers to an instance of XMLHttpRequest instantiated earlier in the script.)

Answer 3

Be sure to include the following line of code in your script:

const xhttp = new XMLHttpRequest();

Answer 4

Be sure to include the following line of code in your script:

const xhttp = new XMLHttpRequest();

Answer 5

Forget about using an extension, JavaScript has the power to handle this task:

How to send cross-domain POST request asynchronously with JavaScript?

Answer 6

Forget about using an extension, JavaScript has the power to handle this task:

How to send cross-domain POST request asynchronously with JavaScript?