How to put header for every request

void simplePostOption(bcl::Request *req) {
        req->headers.emplace_back("Authorization", res::mySetting[MY_BASIC_AUTH].asString());
        log::messageln("The post fields  = %s\n", req->args[4].getStr);
        bcl::setOpts(req, CURLOPT_URL , req->args[0].getStr,
                     CURLOPT_FOLLOWLOCATION, req->args[1].getLong,
                     CURLOPT_WRITEFUNCTION, &bcl::writeContentCallback,
                     CURLOPT_WRITEDATA, req->dataPtr,
                     CURLOPT_USERAGENT, req->args[2].getStr,
                     CURLOPT_RANGE, req->args[3].getStr,
                     CURLOPT_POSTFIELDSIZE, strlen(req->args[4].getStr),
                     CURLOPT_COPYPOSTFIELDS, req->args[4].getStr // for copy
                     );
    }