Something wrong with header parsing in net response

[Gary.Wang]

When implementing ondrive.copy API, the value of the location header provides a URL for a service that will return the current state of the copy operation.E.g
"
HTTP/1.1 202 Accepted
Location: https://onedrive.com/monitor/113jlkjlkjasd1212abcascaf
"

Querying the header's value via the following code
response.header.enumerate([&wrapper](const std::string& key,
                                     const std::set<std::string>& values) {
        for (const auto& v: values) {
            std::cout << "key: " << key <<"value: " << v << std::endl;
        }
});

The results as following:
"
key: Content-Length: 0
value: Content-Length

key: Location: https://api.onedrive.com/v1.0/monitor/3sabmpssppkcg3azgxj63uvwr_3kek-Uznnze3bpj9xeoyvyhzf-4bskzed8ljzsqpa5ea-Kaosno8xhg94wmrcowzfz50qqveam4zhafxgjs2-Xn9ekpmcfwerb7l1lfrlk4dgfdcqrtohn7_hrcpdw
value: Location
"
The key field matches entire header string.
The value filed returns wrong result too.