How to create custom pdfhandler that can download file from different file server

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i need to write custom http handler (Pdf File Handler) for an existing application. 
File is located in shared folder in different server. 

I wrote customPdfFileHandler and place the dll to the bin dir of my webApplicaion. 

 
 Code in customPdfFileHandler is : 
 <pre lang="c#">public void ProcessRequest(HttpContext context)
        {

            dynamic emp = context.Session["EmpID"];
            if (emp == null || string.IsNullOrEmpty(emp))
            {
                HttpContext.Current.Response.StatusCode = 404;
                HttpContext.Current.Response.Flush();

            }
            else
            {
                context.Response.ClearContent();
                context.Response.ClearHeaders();
                context.Response.ContentType =  "application/pdf";
                context.Response.AddHeader("Content-Disposition", "attachment");
                context.Response.TransmitFile(context.Request.RawUrl);
                context.Response.Flush();
                context.Response.Clear();
                context.ApplicationInstance.CompleteRequest();
            }
		}

But this throw error :

Requested URL
http://localhost:55558/ip-myserver/d$/Websites/mysites.net/pdfFiles/archive/Example.pdf

Physical Path
C:\Users\jdoe\Desktop\DemoFolder\DemoWeb\DemoWeb\ip-myserver\d$\Websites\mysites.net\pdfFiles\archive\Example.pdf

file path are given in web.config files of web application.

What I have tried:

public void ProcessRequest(HttpContext context)
        {

            dynamic emp = context.Session["EmpID"];
            if (emp == null || string.IsNullOrEmpty(emp))
            {
                HttpContext.Current.Response.StatusCode = 404;
                HttpContext.Current.Response.Flush();

            }
            else
            {
                context.Response.ClearContent();
                context.Response.ClearHeaders();
                context.Response.ContentType =  "application/pdf";
                context.Response.AddHeader("Content-Disposition", "attachment");
                context.Response.TransmitFile(context.Request.RawUrl);
                context.Response.Flush();
                context.Response.Clear();
                context.ApplicationInstance.CompleteRequest();
            }
		}

Posted 15-Nov-17 5:08am

s23user

Updated 15-Nov-17 5:53am

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Richard Deeming · Answer 1 · 2017-11-15T05:53:00

HttpRequest.RawUrl property[^]:
The raw URL is defined as the part of the URL following the domain information. In the URL string http://www.contoso.com/articles/recent.aspx, the raw URL is /articles/recent.aspx. The raw URL includes the query string, if present.

So given your URL of:

http://localhost:55558/ip-myserver/d$/Websites/mysites.net/pdfFiles/archive/Example.pdf

the RawUrl will be:

/ip-myserver/d$/Websites/mysites.net/pdfFiles/archive/Example.pdf

This will be resolved relative to the current path. So if your application is on drive C:, it will be looking for a file located in:

C:\ip-myserver\d$\Websites\mysites.net\pdfFiles\archive\Example.pdf

It looks like you're trying to load the file from a UNC path, which should be:

\\ip-myserver\d$\Websites\mysites.net\pdfFiles\archive\Example.pdf

Try something like this:

C#

public void ProcessRequest(HttpContext context)
{
    dynamic emp = context.Session["EmpID"];
    if (emp == null || string.IsNullOrEmpty(emp))
    {
        HttpContext.Current.Response.StatusCode = 404;
        HttpContext.Current.Response.Flush();
        return;
    }
    
    Uri path;
    if (!Uri.TryCreate("file:/" + context.Request.RawUrl, UriKind.Absolute, out path))
    {
        HttpContext.Current.Response.StatusCode = 404;
        HttpContext.Current.Response.Flush();
        return;
    }
    
    context.Response.ClearContent();
    context.Response.ClearHeaders();
    context.Response.ContentType =  "application/pdf";
    context.Response.AddHeader("Content-Disposition", "attachment");
    context.Response.TransmitFile(path.LocalPath);
    context.Response.Flush();
    context.Response.Clear();
    context.ApplicationInstance.CompleteRequest();
}

NB: You'll need to make sure that your application pool is running as a user which has permission to read files from the UNC path. You'll probably need to avoid using the default admin shares (d$), and switch to using specific folder shares instead.