(PECL pecl_http >= 0.10.0)
HttpResponse::setThrottleDelay — Set throttle delay
Sets the throttle delay.
Note: Provides a basic throttling mechanism, which will yield the current process or thread until the entity has been completely sent.
Note: This may not work as expected with the following SAPI(s): FastCGI.
seconds to sleep after each chunk sent
如果成功则返回 TRUE，失败则返回 FALSE。