Funny, I've got web pages with JavaScript that talk to Python CGI modules that use SQLAlchemy.

What I do is send AJAX request but with JSON request in the body instead of XML. Python CGI modules use standard json module to deserialize JSON into a dictionary.

JavaScript side looks like this:

function on_request_success(response) {

    console.debug('response', response);

} 



function on_request_error(r, text_status, error_thrown) {

    console.debug('error', text_status + ,  + error_thrown + :n + r.responseText);

}



var request = { ... };

jQuery.ajax({

    url: 'http://host/whatever.cgi',

    type: 'POST',

    cache: false,

    data: JSON.stringify(request),

    contentType: 'application/json',

    processData: false,

    success: on_request_success,

    error: on_request_error

});

And Python like this:

request = json.load(sys.stdin)

response = handle_request(request)

print(Content-Type: application/json, end=nn)

json.dump(response, sys.stdout, indent=2)

Note, it doesn't use Python cgi module, since the whole request is passed as JSON in the body.