CODEWITHSUNDEEP
c#asp.netvisual-studio-2008
James Law
James Law

Reputation: 6733

Change the requested url of WebResource.axd

My web application (http://www.something.com/social/competition/) is currently requesting the WebResource.axd file like this:

<script src="/WebResource.axd?d=xxx" type="text/javascript"></script>

As we're using urlrewiting in a Netscaler to forward all requests for the "/social" folder onto a seperate server farm containing this app, the "/" root path won't resolve correctly as it will be requesting the resource from the something.com app.

Therefore I need to change the url of the requested script to either request it explicitly:

<script src="/social/WebResource.axd?d=xxx" type="text/javascript"></script>

or to request it using a relative path:

<script src="WebResource.axd?d=xxx" type="text/javascript"></script>

So far I've looked at overriding the render method, using a control adapter and various other things but haven't really got anywhere as of yet. Help please.

Upvotes: 9

Views: 8209

Answers (1)

James Law
James Law

Reputation: 6733

Right, so it turns out after extensive research that it's practically impossible to override the rendering process for these files. So the only other option was a filthy, dirty, horrible hack!

protected void Page_Load(object sender, EventArgs e)
    {
        //Initialises my dirty hack to remove the leading slash from all web reference files.
        Response.Filter = new WebResourceResponseFilter(Response.Filter);
    }

public class WebResourceResponseFilter : Stream
{
    private Stream baseStream;

    public WebResourceResponseFilter(Stream responseStream)
    {
        if (responseStream == null)
            throw new ArgumentNullException("ResponseStream");
        baseStream = responseStream;
    }

    public override bool CanRead
    {
        get { return baseStream.CanRead; }
    }

    public override bool CanSeek
    {
        get { return baseStream.CanSeek; }
    }

    public override bool CanWrite
    {
        get { return baseStream.CanWrite; }
    }

    public override void Flush()
    {
        baseStream.Flush();
    }

    public override long Length
    {
        get { return baseStream.Length; }
    }

    public override long Position
    {
        get
        {
            return baseStream.Position;
        }
        set
        {
            baseStream.Position = value;
        }
    }

    public override int Read(byte[] buffer, int offset, int count)
    {
        return baseStream.Read(buffer, offset, count);
    }

    public override long Seek(long offset, System.IO.SeekOrigin origin)
    {
        return baseStream.Seek(offset, origin);
    }

    public override void SetLength(long value)
    {
        baseStream.SetLength(value);
    }

    public override void Write(byte[] buffer, int offset, int count)
    {
        //Get text from response stream.
        string originalText = System.Text.Encoding.UTF8.GetString(buffer, offset, count);

        //Alter the text.
        originalText = originalText.Replace("/WebResource.axd", "WebResource.axd");
        //Write the altered text to the response stream.
        buffer = System.Text.Encoding.UTF8.GetBytes(originalText);
        this.baseStream.Write(buffer, 0, buffer.Length);

    }

This intercepts the stream to the page and replaces all occurrences of "/WebResource.axd" with "WebResource.axd". As it's a relative path it resolves beautifully!

Another solution occurred to me which required installing the web application to a virtual directory which mimicked the "/social" keyword redirect. This would cause asp.net to update the HttpRuntime.AppDomainAppVirtualPath to include the "/social" in the references on the page and would therefore resolve correctly.

Big whoop whoop!

Upvotes: 12

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