Develop Reference

unable to get complete url after # using query string in asp.net c# [duplicate]

I know on client side (javascript) you can use windows.location.hash but could not find anyway to access from the server side. I'm using asp.net.

We had a situation where we needed to persist the URL hash across ASP.Net post backs. As the browser does not send the hash to the server by default, the only way to do it is to use some Javascript:
When the form submits, grab the hash (window.location.hash) and store it in a server-side hidden input field Put this in a DIV with an id of "urlhash" so we can find it easily later.
On the server you can use this value if you need to do something with it. You can even change it if you need to.
On page load on the client, check the value of this this hidden field. You will want to find it by the DIV it is contained in as the auto-generated ID won't be known. Yes, you could do some trickery here with .ClientID but we found it simpler to just use the wrapper DIV as it allows all this Javascript to live in an external file and be used in a generic fashion.
If the hidden input field has a valid value, set that as the URL hash (window.location.hash again) and/or perform other actions.
We used jQuery to simplify the selecting of the field, etc ... all in all it ends up being a few jQuery calls, one to save the value, and another to restore it.
Before submit:
$("form").submit(function() {
$("input", "#urlhash").val(window.location.hash);
});
On page load:
var hashVal = $("input", "#urlhash").val();
if (IsHashValid(hashVal)) {
window.location.hash = hashVal;
}
IsHashValid() can check for "undefined" or other things you don't want to handle.
Also, make sure you use $(document).ready() appropriately, of course.

[RFC 2396][1] section 4.1:
When a URI reference is used to perform a retrieval action on the
identified resource, the optional fragment identifier, separated from
the URI by a crosshatch ("#") character, consists of additional
reference information to be interpreted by the user agent after the
retrieval action has been successfully completed. As such, it is not
part of a URI, but is often used in conjunction with a URI.
(emphasis added)
[1]: https://www.rfc-editor.org/rfc/rfc2396#section-4

That's because the browser doesn't transmit that part to the server, sorry.

Probably the only choice is to read it on the client side and transfer it manually to the server (GET/POST/AJAX).
Regards
Artur
You may see also how to play with back button and browser history
at Malcan

Just to rule out the possibility you aren't actually trying to see the fragment on a GET/POST and actually want to know how to access that part of a URI object you have within your server-side code, it is under Uri.Fragment (MSDN docs).

Possible solution for GET requests:
New Link format: http://example.com/yourDirectory?hash=video01
Call this function toward top of controller or http://example.com/yourDirectory/index.php:
function redirect()
{
if (!empty($_GET['hash'])) {
/** Sanitize & Validate $_GET['hash']
If valid return string
If invalid: return empty or false
******************************************************/
$validHash = sanitizeAndValidateHashFunction($_GET['hash']);
if (!empty($validHash)) {
$url = './#' . $validHash;
} else {
$url = '/your404page.php';
}
header("Location: $url");
}
}

Retrieve the Original (Client) Url Without the Default Document [duplicate]

I would like to get the exact url that user typed into the browser. Of course I could always use something like Request.Url.ToString() but this does not give me what i want in the following situation:
http://www.mysite.com/rss
With the url above what Request.Url.ToString() would give me is:
http://www.mysite.com/rss/Default.aspx
Does anyone know how to accomplish this?
I have already tried:
Request.Url
Request.RawUrl
this.Request.ServerVariables["CACHE_URL"]
this.Request.ServerVariables["HTTP_URL"]
((HttpWorkerRequest)((IServiceProvider)HttpContext.Current).GetService(typeof(HttpWorkerRequest))).GetServerVariable( "CACHE_URL")
((HttpWorkerRequest)((IServiceProvider)HttpContext.Current).GetService(typeof(HttpWorkerRequest))).GetServerVariable( "HTTP_URL")

Edit: You want the HttpWorkerRequest.GetServerVariable() with the key HTTP_URL or CACHE_URL. Note that the behavior differs between IIS 5 and IIS 6 (see documentation of the keys).
In order to be able to access all server variables (in case you get null), directly access the HttpWorkerRequest:
HttpWorkerRequest workerRequest =
(HttpWorkerRequest)((IServiceProvider)HttpContext.Current)
.GetService(typeof(HttpWorkerRequest));

Remember too that the "exact URL that the user entered" may never be available at the server. Each link in the chain from fingers to server can slightly modify the request.
For example if I type xheo.com into my browser window, IE will be convert to http://www.xheo.com automatically. Then when the request gets to IIS it says to the browser - you really want the default page at http://www.xheo.com/Default.aspx. So the browser responds by asking for the default page.
Same thing happens with HTTP 30x redirect requests. The server will likely only ever see the final request made by the browser.

Try using Request.Url.OriginalString
Might give you the thing you are looking for.

It is possible, you just need to combining a few of the values from the request object to rebuild the exact url entered:
Dim pageUrl As String = String.Format("{0}://{1}{2}",
Request.Url.Scheme,
Request.Url.Host,
Request.RawUrl)
Response.Write(pageUrl)
Entering the address http://yousite.com/?hello returns exactly:
http://yousite.com/?hello

Request.RawUrl
I think is the monkey you are after...

Easiest way to do this is used client-side programming to extract the exact url:
<script language="javascript" type="text/javascript">
document.write (document.location.href);
</script>

How can I make sure a url provided by the user is not a local path?

I'm writhing a web application (ASP.Net MVC, C#) that require the user to provide urls to RSS or Atom Feed that I then read with the following code :
var xmlRdr = XmlReader.Create(urlProvidedByUserAsString);
var syndicFeed = SyndicationFeed.Load(xmlRdr);
While debugging my application I accidentally passed /something/like/this as an url and I got an exception telling me that C:\something\like\this can't be opened.
It looks like a user could provide a local path and my application would try to read it.
How can I make this code safe? It probably is not sufficient to check for https:// or http:// at the begining of the url, since the user could still enter something like http://localhost/blah. Is there any other way, maybe with the uri class to check if an url is pointing to the web?
Edit: I think I also need to prevent the user from entering adresses that would point to other machines on my network like this example: http://192.168.0.6/ or http://AnotherMachineName/

Try:
new Uri(#"http://stackoverflow.com").IsLoopback
new Uri(#"http://localhost/").IsLoopback
new Uri(#"c:\windows\").IsLoopback

Converting a web address to a valid href value

Firstly, this seems like something that should have been asked before, but I cannot find anything that answers my question.
A basic overview of my task is to render an anchor link on a web page which is based on a user defined web address. As the address is user defined this could be in any format, for example:
http://www.example.com
https://www.example.com
www.example.com
example.com
What I need to do with this value is to set it as the href property of an anchor tag. Now, the problem is that (in Chrome at least) only the first two examples will work due to the fact they are recognised as absolute URL paths. The last two examples will redirect to the same domain (i.e. treated as relative paths)
So the ultimate question is: What is the best way to format these values to ensure a consistent absolute path is used? I could check for http/https and add it if missing, but I was hoping there might be an out of the box .Net class that would be more reliable.
In addition, as this is a user defined value, it could be complete junk anyway so a function to validate the URL would be a nice bonus too.

We ran into this problem a few months back, and needed a consistent way of ensuring the URLs were absolute. We also wanted a way of removing http(s):// for displaying the URL on the web page.
I came up with this function:
public static string FormatUrl(string Url, bool IncludeHttp = null)
{
Url = Url.ToLower();
switch (IncludeHttp) {
case true:
if (!(Url.StartsWith("http://") || Url.StartsWith("https://")))
Url = "http://" + Url;
break;
case false:
if (Url.StartsWith("http://"))
Url = Url.Remove(0, "http://".Length);
if (Url.StartsWith("https://"))
Url = Url.Remove(0, "https://".Length);
break;
}
return Url;
}
I know you're after an "out of the box" library, but this may be of some help.
I think the problem with an "out of the box" solution would be that the function won't know whether the URL should be http:// or https://. With my function I've made an assumption that its going to be http://, but for some URLs you need https://. If Microsoft were to build something like this into the framework, it would be buggy from the start.

You can try using this overload of the Uri class:
Uri Constructor (String)
This constructor creates a Uri instance from a URI string. It parses the URI, puts it in canonical format, and makes any required escape encodings.
This constructor does not ensure that the Uri refers to an accessible resource.
This constructor assumes that the string parameter references an absolute URI and is equivalent to calling the Uri constructor with UriKind set to Absolute. If the string parameter passed to the constructor is a relative URI, this constructor will throw a UriFormatException.
This will try to construct a canonical Uri from the user input. And you have lots of properties to check and extract the URL parts that you need.

Truncating Query String & Returning Clean URL C# ASP.net

I would like to take the original URL, truncate the query string parameters, and return a cleaned up version of the URL. I would like it to occur across the whole application, so performing through the global.asax would be ideal. Also, I think a 301 redirect would be in order as well.
ie.
in: www.website.com/default.aspx?utm_source=twitter&utm_medium=social-media
out: www.website.com/default.aspx
What would be the best way to achieve this?

System.Uri is your friend here. This has many helpful utilities on it, but the one you want is GetLeftPart:
string url = "http://www.website.com/default.aspx?utm_source=twitter&utm_medium=social-media";
Uri uri = new Uri(url);
Console.WriteLine(uri.GetLeftPart(UriPartial.Path));
This gives the output: http://www.website.com/default.aspx
[The Uri class does require the protocol, http://, to be specified]
GetLeftPart basicallys says "get the left part of the uri up to and including the part I specify". This can be Scheme (just the http:// bit), Authority (the www.website.com part), Path (the /default.aspx) or Query (the querystring).
Assuming you are on an aspx web page, you can then use Response.Redirect(newUrl) to redirect the caller.

Here is a simple trick
Dim uri = New Uri(Request.Url.AbsoluteUri)
dim reqURL = uri.GetLeftPart(UriPartial.Path)

Here is a quick way of getting the root path sans the full path and query.
string path = Request.Url.AbsoluteUri.Replace(Request.Url.PathAndQuery,"");

This may look a little better.
string rawUrl = String.Concat(this.GetApplicationUrl(), Request.RawUrl);
if (rawUrl.Contains("/post/"))
{
bool hasQueryStrings = Request.QueryString.Keys.Count > 1;
if (hasQueryStrings)
{
Uri uri = new Uri(rawUrl);
rawUrl = uri.GetLeftPart(UriPartial.Path);
HtmlLink canonical = new HtmlLink();
canonical.Href = rawUrl;
canonical.Attributes["rel"] = "canonical";
Page.Header.Controls.Add(canonical);
}
}
Followed by a function to properly fetch the application URL.
Works perfectly.

I'm guessing that you want to do this because you want your users to see pretty looking URLs. The only way to get the client to "change" the URL in its address bar is to send it to a new location - i.e. you need to redirect them.
Are the query string parameters going to affect the output of your page? If so, you'll have to look at how to maintain state between requests (session variables, cookies, etc.) because your query string parameters will be lost as soon as you redirect to a page without them.
There are a few ways you can do this globally (in order of preference):
If you have direct control over your server environment then a configurable server module like ISAPI_ReWrite or IIS 7.0 URL Rewrite Module is a great approach.
A custom IHttpModule is a nice, reusable roll-your-own approach.
You can also do this in the global.asax as you suggest
You should only use the 301 response code if the resource has indeed moved permanently. Again, this depends on whether your application needs to use the query string parameters. If you use a permanent redirect a browser (that respects the 301 response code) will skip loading a URL like .../default.aspx?utm_source=twitter&utm_medium=social-media and load .../default.aspx - you'll never even know about the query string parameters.
Finally, you can use POST method requests. This gives you clean URLs and lets you pass parameters in, but will only work with <form> elements or requests you create using JavaScript.

Take a look at the UriBuilder class. You can create one with a url string, and the object will then parse this url and let you access just the elements you desire.

After completing whatever processing you need to do on the query string, just split the url on the question mark:
Dim _CleanUrl as String = Request.Url.AbsoluteUri.Split("?")(0)
Response.Redirect(_CleanUrl)
Granted, my solution is in VB.NET, but I'd imagine that it could be ported over pretty easily. And since we are only looking for the first element of the split, it even "fails" gracefully when there is no querystring.