Tomcat does not flush the response buffer

Question

i tested HttpResponse#flushBuffer and PrintWriter#flush on Tomcat 7 below, but it seemed that the response rather ignored them than fl

Answer 1

The API for flushBuffer() is very precise:

Forces any content in the buffer to be written to the client. A call to this method automatically commits the response, meaning the status code and headers will be written.

So either Tomcat is not implemented according to the spec (buffers more aggressively and holds flushes if they are too small) or the client (browser) waits for more input before actually rendering it.

Can you try with curl or nc instead?