Remote server (403) Forbidden error while using WebClient

Question

I am trying to query some URL using WebClient.

I have a collection which I loop through to get the QueryString value, and build final URL,

Answer 1

If everything you said is correct, then I suspect server throttling is playing a part. Try adding a Thread.Sleep in your loop to slow things down.

Answer 2

Some web servers can block requests based on the user agent string they provide. In your case, you send an empty string as a user agent. Try to add the user agent of a browser, any browser would be fine.

For example:

client.Headers.Add("user-agent", " Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0");

For a list of user agents, you can click here.