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What is causing a jQuery Ajax call to a Python script to throw a 500 error?

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I have a website that has a jQuery Ajax call to a Python script. When I call it, it returns a 500 error. Note that the Python script itself works when submitted through a cron job; it is only when trying to call it through Ajax does the error appear.

Excerpt of the HTML page that makes the call:

<!DOCTYPE html><html><head><title>Python Test</title><script src="jquery-3.3.1.js"></script></head><body><div id="the_output">The text returned from the Python script goes here</div><script>$.ajax({         url:"cgi-bin/PythonTest.py",         type:"POST",         success:function(data) {             try {                 document.getElementById("the_output").innerHTML = data;             }             catch (e) {                 document.getElementById("the_output").innerHTML = "<b>Error parsing data:</b><br />" + data;             }         },         error:function(xhr, status, error) {            let errorMessage = "<b>Query returned a failure:</b><br />"+"Status: " + status +"<br />"+"Error: " + error +"<br />"+"XHR Response Text:<br />{" + xhr.responseText +"}";            document.getElementById("the_output").innerHTML = errorMessage;         }       });</script></body></html>

And PythonTest.py:

#!/usr/bin/env python3print("<br />If you can read this, then It Works<br />")

When I enter the URL of the page in a browser, what comes back is:

Query returned a failure

Status: error

Error: Internal Server Error

and the XHR Response has the HTML of the web host's page for a 500 error.

Should I be adding something to the Ajax call?

EDIT: When I enter the URL directly into a browser, it returns the same 500 error page that the Ajax call returns. It doesn't appear to be browser-specific, as it happens with Edge, Firefox, and Chrome.Also, I did check to make sure the line terminators in the script are Unix-style, not DOS-style, and I don't have any problem running PHP scripts on it - just Python.


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