How get curlpp response header

Question

I'm calling a REST WS with a JSON payload to subscribe certains events. The server answer with HTTP-Code 201 and a field named Location in the HTTP-Header with the ID of the subscription.

As an example, in curl (-v) we get:

[...]
< HTTP/1.1 201 Created
< Connection: Keep-Alive
< Content-Length: 0
< Location: /v2/subscriptions/5ab386ad4bf6feec37ffe44d
[...]

In C++ using curlpp we want to retrieve that id looking at the response header. Now we have only the body response (in this case empty).

std::ostringstream response;
subRequest.setOpt(new curlpp::options::WriteStream(&response));

// Send request and get a result.
subRequest.perform();

cout << response.str() << endl;

How can we obtain the Location header's field (whose content in the example is "/v2/subscriptions/5ab386ad4bf6feec37ffe44d") in C++ using curlpp?

NOTE: Redirecting cout and cerr doesn't seems work. – LuisGP Mar 22 '18 at 11:24 — LuisGP, Mar 22 '18 at 11:24

LuisGP · Answer 1 · 2018-03-22T11:43:42.730

2

Ok, I found it.

Simply adding

subRequest.setOpt(new curlpp::options::Header(1));

do the trick and stores headers in the response.

edited Mar 22 '18 at 11:43

answered Mar 22 '18 at 10:46

LuisGP

431
3
13

score 2 · Accepted Answer · answered Sep 29 '18 at 19:11

There are several values you can retrieve using the family of curlpp::infos::*::get functions. For example the HTTP response code:

curlpp::infos::ResponseCode::get(subRequest)

See the Infos.hpp header for a complete list. When you need a value that is not available through one of these infos you can also choose to receive the headers separately from the body in a callback.

subRequest.setOpt(new curlpp::options::HeaderFunction(
    [] (char* buffer, size_t size, size_t items) -> size_t {
        std::string s(buffer, size * items); // buffer is not null terminated
        std::cout << s;
        return size * items;
    }));

How get curlpp response header

2 Answers2