HTTP的GET消息格式修改

在使用sofa-pbrpc时，经常会遇到get消息中参数很少的情况，比如：http://XXX/ip2location.parse?request={"ip":"124.117.112.2"},但是常规来说大家倾向于使用http://XXX/ip2location.parse?ip=124.117.112.2的方式，所以需要对sofa-pbrpc源码进行修改：
修改sofa-pbrpc/src/sofa/pbrpc/http_rpc_request.cc:109文件：
json_str = _query_params["request"];
更新为：
if(_query_params.find("request") != _query_params.end())
{
json_str = _query_params["request"];
}
if (json_str == "" && _query_params.size() != 0)
{
bool add = false;
json_str = "{";
for (std::map::iterator it = _query_params.begin(); it != _query_params.end(); ++it)
{
if(add)
{
json_str += ",";
}
else
{
add = true;
}
json_str += "\"";
json_str += it->first;
json_str += "\":\"";
json_str += it->second;
json_str += "\"";
}
json_str += "}";
}
代码不是很规范，还请团队帮忙修改。

Start in sofa-pbrpc/src/sofa/pbrpc/http_rpc_request.cc at line 109, where the request query is read from the request parameter. Review how query parameters are represented there and support the documented direct-parameter GET form while preserving the existing request form. Done means both URL styles produce the intended request data.

Written by the indexing model from the issue text.