Retrieving status code without reliance on a back-end language (maybe through JavaScript?)

My new service offers a solution for error pages in web apps by providing a code snippet that can be easily copied and pasted into the error page templates, similar to Google Analytics. The status code is embedded in a hidden input within the installation code. However, I want to avoid making the installation code dependent on server-side languages like PHP or Ruby. I am looking for a dynamic method to retrieve the status code from the HTTP request without hard-coding them, which would require separate installation codes for each error page (though we are mainly concerned with 500s & 404s). One option seems too complex, so any suggestions not found through Google or my developer friends would be greatly appreciated.

javascriptstatushttp-status-codes

Answer №1

It is not possible to retrieve the HTTP status code directly from an HTML page or a JavaScript function. The XMLHttpRequest object has access to it because it generates its own Http request. This connection originates from the XMLHttpRequest, separate from the page's loaded content containing the JavaScript code.

Incorporating the HTTP status code directly into HTML or JavaScript would blur the lines between different layers such as the transport layer and application layer. For instance, what happens when you load a .html file from a local filesystem? What about accessing an HTML page from an FTP server or a SVN Repository?

Answer №2

Utilizing XmlHttpRequest allows you to fetch data from a text file on your server that is completely separate from the server-side language being used.

The text file could contain values separated by commas or semicolons, which can be easily split once the request is complete.

Remember: You will need to access the responseText property of the XmlHttpRequest object.

I hope this explanation clarifies things for you.

Answer №3

From my understanding, there doesn't seem to be a straightforward way to determine the status code of a page using code that is placed directly on that page. While you can fetch the status code through an Ajax request to a specific URL, it might be impractical to perform this request twice for each page load.

One potential approach could be implementing modifications to your server-side error handlers (404, 500, etc.) in order to include details about the status code within the page itself. For instance, adding a script like 

<script>document.status = "404";</script>
would allow you to retrieve this information using JavaScript.

Answer №4

Neil.

Check out this code snippet for better understanding.

function generateHttpRequest()
{
    if (window.XMLHttpRequest)
        return new XMLHttpRequest();

    if (window.ActiveXObject)
    {
        var types = [
            "Msxml2.XMLHTTP.6.0",
            "Msxml2.XMLHTTP.3.0",
            "Msxml2.XMLHTTP",
            "Microsoft.XMLHTTP"
        ];
        for(var i in types)
        {
            try{ return new ActiveXObject(types[i]); }
            catch(e){}
        }
    }
    return null; // not supported
}
xhrObject = generateHttpRequest();

xhrObject.onreadystatechange = function() 
{
    if(xhrObject.readyState == 4 && xhrObject.status == 200) 
    {
        document.getElementById('hidden_input_value').value = xhrObject.responseText;
    } 
}

xhrObject.open('GET', 'your_text_file.txt', true); 
xhrObject.send(null);

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