Getting the HTTP Referrer in ASP NET

Question

I m looking for a quick  easy and reliable way of getting the browser s HTTP Referrer in ASP Net  C     I know the HTTP Referrer itself is unreliable  but I do want a reliable way of getting the referrer if it is present

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string referrer   HttpContext Current Request UrlReferrer ToString

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Sometime you must to give all the link like this   System Web HttpContext Current Request UrlReferrer ToString       in option when  Current  not founded

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Since Google takes you to this post when searching for C  Web API Referrer here s the deal  Web API uses a different type of Request from normal MVC Request called HttpRequestMessage which does not include UrlReferrer  Since a normal Web API request does not include this information  if you really need it  you must have your clients go out of their way to include it  Although you could make this be part of your API Object  a better way is to use Headers   First  you can extend HttpRequestMessage to provide a UrlReferrer   method   public static string UrlReferrer this HttpRequestMessage request        return request Headers Referrer    null    unknown    request Headers Referrer AbsoluteUri      Then your clients need to set the Referrer Header to their API Request      Microsoft AspNet WebApi Client client DefaultRequestHeaders Referrer   new Uri url     And now the Web API Request includes the referrer data which you can access like this from your Web API   Request UrlReferrer

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Request Headers  quot Referer quot    Explanation The Request UrlReferer property will throw a System UriFormatException if the referer HTTP header is malformed  which can happen since it is not usually under your control   Therefore  the Request UrlReferer property is not 100  reliable - it may contain data that cannot be parsed into a Uri class  To ensure the value is always readable  use Request Headers  quot Referrer quot   instead  As for using Request ServerVariables as others here have suggested  per MSDN  Request ServerVariables Collection  The ServerVariables collection retrieves the values of predetermined environment variables and request header information   Request Headers Property  Gets a collection of HTTP headers   Request Headers is a better choice than Request ServerVariables  since Request ServerVariables contains all of the environment variables as well as the headers  where Request Headers is a much shorter list that only contains the headers  So the most reliable solution is to use the Request Headers collection to read the value directly  Do heed Microsoft s warnings about HTML encoding the value if you are going to display it on a form  though

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Like this  HttpRequest UrlReferrer Property   Uri myReferrer   Request UrlReferrer  string actual   myReferrer ToString

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I m using  Net Core 2 mvc  this one work for me   to get the previews page     HttpContext Request Headers  Referer

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Belonging to other reply  I have added condition clause for getting null   string ComingUrl       if  Request UrlReferrer    null        ComingUrl   System Web HttpContext Current Request UrlReferrer ToString      else       ComingUrl    Direct      Your code

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Use the Request UrlReferrer property   Underneath the scenes it is just checking the ServerVariables  HTTP REFERER   property

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You could use the UrlReferrer property of the current request   Request UrlReferrer   This will read the Referer HTTP header from the request which may or may not be supplied by the client  user agent

[c#] Getting the HTTP Referrer in ASP.NET

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