Solved

How to check for 404 without throwing an exception?

Posted on 2006-07-18
4
707 Views
Last Modified: 2008-01-09
I want to check for the availability of a file on a web server, using the .net framework. I can easily use a WebClient or WebRequest to attempt to get data from the URL, then catch the exception that is thrown if the requested file doesn't exist.

But I want to perform this check without exceptions - I don't like using exceptions to control program flow. Is there a way to get the headers back from the web server and check them myself, or to tell some framework class to just get me the data and ignore the 404 indication in the header?
0
Comment
Question by:jgr4
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 1

Accepted Solution

by:
winsoftech earned 200 total points
ID: 17143803
u can use xmlhttp method to call the page
using xmlhttp.open(url,'','')
this will rerutn status (xmlhttp.status)
if page is not present then it will return 404

u can use this to check for 404 without throwing an exception

it's not complete code u have to find on xmlhttp
0
 
LVL 3

Expert Comment

by:HouseMusic
ID: 17150181
You can use the custom errors section of your web.config to redirect them to a specific error page for that error (i.e. errorpage.aspx) and handle it in that "errorpage.aspx"

0
 
LVL 2

Author Comment

by:jgr4
ID: 17151167
winsoftech - that's a good hint and I'll give you the points if nothing better comes along, but I'm really looking for a way to do this from inside the .NET framework. I'm doing this from what will be a freeware app and I don't want to deal with versioning issues.

HouseMusic - I'm the client, not the server. This is a windows app looking for files on other people's webservers.
0

Featured Post

Get your Conversational Ransomware Defense e‑book

This e-book gives you an insight into the ransomware threat and reviews the fundamentals of top-notch ransomware preparedness and recovery. To help you protect yourself and your organization. The initial infection may be inevitable, so the best protection is to be fully prepared.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This document covers how to connect to SQL Server and browse its contents.  It is meant for those new to Visual Studio and/or working with Microsoft SQL Server.  It is not a guide to building SQL Server database connections in your code.  This is mo…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

622 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question