Hi Chris,

Servlet 3.1 spec defines that ServletInputStream can be used to read as 
non-blocking way as long as there is data ready locally by calling isReady 
method and check the ready condition before calling read, and read should throw 
IllegalStateException if called by caller when data is not ready

Agree that InputStream read api is blocking by nature, but if the data is 
already there in local buffer, then it’s not, it’s just exposing as 


> On Sep 21, 2021, at 2:26 PM, Christopher Schultz 
> <ch...@christopherschultz.net> wrote:
> Andrew,
>> On 9/21/21 13:54, Javateck wrote:
>> Hi,
>> With NIO connector with Servlet 3.1 support, I’m registering with a 
>> ReadListener, while it got the first read signal from tomcat container (I 
>> tried 9.0.19 and 9.0.53), the read call is blocked after isReady returns true
>>   if (ServletInputStream.isReady()) {
>>        ServletInputStream.read(buffer);  // this becomes blocking
>>   }
>> I tried with jetty, it’s working fine
>> When I did the test, I was holding the sending packet from client side
>> Not sure whether anyone has tried this
> InputStream is always blocking.
> Are you trying to use async? That's not the way to use async...
> -chris
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