修改http头信息

用WebHeaderCollection是无法完成的，因为其限制修改

Referer 和User-Agent

 

只能用注册表修改的方法

A standard user agent string would look similar to:

Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)
Which means Internet Explorer 5.5 running on Windows 2000.

Changing the Default User Agent Values
Open your registry and find the key below. If it does not already exist then create it.

[HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Internet Settings/5.0/User Agent]

Create three new string values called "Compatible", "Version" and "Platform". Set them to equal what you would like to be displayed instead of "compatible", "MSIE 5.5" and "Windows NT 5.0" respectively in the example above.

You can also modify the value of "(Default)" to change the browser name "Mozilla/4.0" in the example above.

Changing the Branded User Agent String
In addition when a customized user agent string is used it may contain additional information set by the company that created a branded version of the browser. For example a branded version from an ISP may look like:

Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0; Your_ISP_Name)
Since this information is sent to the remote web server it may be stored in the web server log files and therefore possibly used to track branded versions of a web browser.

To change it open your registry and find the key [HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Internet Settings/User Agent/Post Platform].

Each value name listed in this key will be sent to the remote web server as an additional entry in the user agent string. To remove any additional information delete the values within the [Post Platform] key. To add additional entries create a string value and name it the string you want to be sent.

Restart Internet Explorer for the changes to take effect.

Note: This tweak may affect some online services that read this information to detect the operating system such as Microsoft Windows Update.

		{Default)	REG_SZ	Mozilla/4.0
		Compatible	REG_SZ	compatible
		Version	REG_SZ	MSIE 5.5
		Platform	REG_SZ	Windows NT 5.0

	HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion...

Registry Settings

System Key: [HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/ Internet Settings/5.0/User Agent] Value Name: (Default), Compatible, Version, Platform Data Type: REG_SZ (String Value)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.