[curlpp:182] Access optional response information (eg. Content-Type)

[duselbaer]

Hi there,

I'm using curl++ to create a client library for a service which speaks
HTTP.

If I try to access a header field which does not exist in my response
(eg. COntent-Type), curl_easy_getinfo signals this by returning a NULL
pointer.

But

  std::string ret = curlpp::infos::ContentType().get(curlRequest);

cannot return a NULL pointer :)

If a header field did not exist, it caused crashes because the
InfoTypeConverter<std::string> did not handle this case properly. I
fixed this by handeling the NULL pointer cause explicitely there

template<>
void
InfoTypeConverter<std::string>::get(curlpp::Easy & handle,
                      CURLINFO info,
                      std::string & value)
{
  char * tmp;
  InfoGetter::get(handle, info, tmp);
  if (tmp)
    value = tmp;
  else
    value.clear();
}

But I'm not sure if this is the right way. Is there any possibility to
check whether a header field exists or not?

Regards,

Ronny

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