HttpClient singleton thread-safe-CodePudding

When using HttpClient said generally want to use the singleton pattern, just think of whether thread-safe, multiple threads to get the same instance, for the same instance operation, will not affect each other?
Just do a simple test,

 
The static readonly HttpClient client=new HttpClient (); 
The static void Main (string [] args) 
{
(A); 
Thread.Sleep(1000); 
(B); 

Console.ReadLine(); 
} 

Public static void (A) 
{
New Thread (()=& gt; 
{
Client. DefaultRequestHeaders. Add (" a ", "a"); 
Console. WriteLine (" (A) set A "); 
Thread.sleep (10000); 
Console. WriteLine (" (A) sleep stop "); 
}). The Start (); 

} 
Public static void (B) 
{
Console. WriteLine (" (B) start "); 
If (client. DefaultRequestHeaders. The Contains (" a ")) 
Console. WriteLine (" has a "); 

Console. WriteLine (" (B) end "); 
}

The results
(A) set A
(B) start
From a
(B) end
(A) sleep stop
Execution result shows that the thread is unsafe,

With MultiThreadedHttpConnectionManager ensure thread safety in Java, c # in how to deal with? Or did I understand there is a problem?

CodePudding user response:

Now that to change the header, and that is another example (also can be another singleton?)