<div dir="ltr"><div class="gmail_extra"><span style="font-size:12.8px">Hi</span><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">the <span style="font-size:12.8px"> 'forward_req_params' didnt help me because it get parameter value from client but my dynamic parameter should generate in server before it send request to external server.</span></div></div><div class="gmail_extra"><br></div><div class="gmail_extra">I also find this link about embeding python code in yaml file. but it seem it need some change in mapproxy configuration parser to exec the codes.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><a href="http://stackoverflow.com/questions/26062256/execute-python-code-embedded-in-yaml-file" target="_blank">http://stackoverflow.com/questions/26062256/execute-python-code-embedded-in-yaml-file</a><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><a href="http://stackoverflow.com/questions/21219138/how-to-embed-python-code-into-yaml" target="_blank">http://stackoverflow.com/questions/21219138/how-to-embed-python-code-into-yaml</a><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Regards</div><div class="gmail_extra"><br></div></div>