C# must modify this header workaround with the appropriate attributes or methods

Little scum · Posted on 3/14/2018 10:24:54 AM

When the headers requests of the http protocol are set in the Asp.Net, the attributes defined by some protocols are already encapsulated, and the submission cannot be customized using the Add method.

When using the httpwebrequest and webrequest class in C#, if you try to set the header of the http request, whether you use the set method or the add method, for example, we set the referer property in the header:

request. Headers.Set("Referer", "itsvse.com");
request. Headers.Add("Referer", "itsvse.com");
will error: "This header must be modified with the appropriate attribute or method".

Reason: C# doesn't allow you to use the set and add methods to set such headers

C# already provides a dedicated attribute for such a header that you can use when modifying and setting this header.

The header name and corresponding attributes are set as follows:

Header	Set up
Accept	Accept property.
Connection	Set by the Connection property and the KeepAlive property.
Content-Length	Set by the ContentLength property.
Content-Type	Setby the ContentType property.
Expect	Set by the Expect property.
Date	Set by the Date property.
Host	Host property.
If-Modified-Since	Set by the IfModifiedSince property.
Range	Set by the AddRange method.
Referer	Set by the Referer property.
Transfer-Encoding	Set by the TransferEncoding property (the SendChunked property must be true).
User-Agent	UserAgent property

As shown in the table above, we modify the Referer, all you need to do is

request. Referer = "itsvse.com";

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[ASP.NET] C# must modify this header workaround with the appropriate attributes or methods

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