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How set TOS field for Soap traffic of Apache

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http://stackoverflow.com – Recently I am doing QOS for our software system which consists of apache+php server app and a C++ server app. We want to use the TOS field in IP header to differentiate different services. I know we can set the TOS field for c++ application traffic by calling setsockopt(fd, IPPROTO_IP, &TosVal, ...). However,I don't know how to set the TOS field for packets of soap traffic of apache using PHP. I have below questions: 1) Is it possible to set the TOS field when we are using php+apache to send a soap response. 2) If the answer to question 1) is yes, then how? (HowTos)