The class DumpRequestResourceHandler: CefResourceHandler 
{
Private static int _requestNo; 

Private byte [] responseData; 
Private int pos. 

Protected override void GetResponseHeaders (CefResponse response, out long responseLength, out string redirectUrl) 
{
The response. The Status=200; 
The response. The MimeType="text/HTML"; 
The response. StatusText="OK, hello from handler!" ; 
Var headers=new NameValueCollection (StringComparer InvariantCultureIgnoreCase); 
Headers. The Add (" cache-control ", "private"); 
Headers. The Add (" Access - Control - Allow - Origin ", "*"); 
The response. SetHeaderMap (headers); 
ResponseLength=responseData=https://bbs.csdn.net/topics/=null? 0: responseData. Length; 
RedirectUrl=null; 
} 

Protected override bool Open (CefRequest request, out bool handleRequest, CefCallback callback) 
{
Thread the Thread=new Thread (()=& gt; 
{
Var response=new StringBuilder (); 
Try 
{
Var requestNo=Interlocked. Increment (ref _requestNo); 
String [] para; 
If (request PostData!=null) 
{
Para.=HttpUtility UrlDecode (Encoding UTF8. Get string (request) PostData) GetElements () [0]. GetBytes ())). The Split (' & amp; '); 
} 
The else 
{
Var. Pl=HttpUtility UrlDecode (request Url). The Split (' & amp; '); 
Para=new string (pl. Length - 1), 
For (int I=1; i {
Para [I - 1]=pl [I]; 
} 
} 
The response. Append (" Testing!!!!!! "); 
} 
The catch (Exception ex) 
{
The response. Append (ex. Message + ex. StackTrace); 
} 
The finally {
ResponseData=https://bbs.csdn.net/topics/Encoding.UTF8.GetBytes (response. The ToString ()); 
The callback. The Continue (); 
} 
}); 
Thread. The Start (); 
HandleRequest=true; 
return true; 
} 

Protected override bool Read (IntPtr dataOut, int bytesToRead, out int bytesRead, CefResourceReadCallback callback) 
{
Var dataLen null=responseData=https://bbs.csdn.net/topics/=? 0: responseData. Length; 
If (bytesToRead==0 | | pos & gt;=dataLen) 
{
BytesRead=0; 
return false; 
} 
The else 
{
Pos +=bytesToRead; 
BytesRead=bytesToRead; 
DataOut=(IntPtr) pos; 
return true; 
} 
} 

Protected override bool Skip (long bytesToSkip, out long bytesSkipped, CefResourceSkipCallback callback) 
{
BytesSkipped=bytesToSkip; 
return false; 
} 
Protected override void the Cancel () 
{
} 

} 

This is the version data

 
Internal static unsafe partial class libcef 
{
Public const string CEF_VERSION="88.2.9 + g5c8711a + chromium - 88.0.4324.182"; 
Public const int CEF_VERSION_MAJOR=88; 
Public const int CEF_COMMIT_NUMBER=2301; 
Public const string CEF_COMMIT_HASH="5 c8711aa6017c48688dd03915062bd5f9382ee3e"; 

Public const int CHROME_VERSION_MAJOR=88; 
Public const int CHROME_VERSION_MINOR=2; 
Public const int CHROME_VERSION_BUILD=4324; 
Public const int CHROME_VERSION_PATCH=182; 

Public const string CEF_API_HASH_UNIVERSAL="89715 b43c948313782d2546131f510eab1975844"; 

Public const string CEF_API_HASH_PLATFORM_WIN="80648 a2c5a87db1581fdb994b7154ed77d74a3c5"; 
Public const string CEF_API_HASH_PLATFORM_MACOS="3 af393a2bf165edd934c5a59f6e6fce8a4bb579c"; 
Public const string CEF_API_HASH_PLATFORM_LINUX="8049 cab9a43c1d554ccdd4dd3d5e38ecebce42af"; 
} 

This is the complete code to realize the class, I met now the question is: how to return the data to the caller,