Basic HTTP Client with Poco
After my previous terrible experience with cpp-netlib, I was very very pleasantly surprised by how well this went.
You can get the Poco C++ libraries here
This is the short wget equivalent ...
#include <algorithm> // for copy
#include <iterator>
#include <string>
#include <iostream> // for cout, istream
#include <Poco/Exception.h>
#include <Poco/Net/HTTPClientSession.h>
#include <Poco/Net/HTTPRequest.h>
#include <Poco/Net/HTTPResponse.h>
#include <Poco/Path.h>
#include <Poco/URI.h>
using string = std::string;
int main(int argc, char*argv[]) {
if (argc != 2) {
std::cerr << "Usage: " << argv[0] << " <url>" << std::endl;
return 1;
}
try {
// Initialize session
Poco::URI uri(argv[1]);
Poco::Net::HTTPClientSession client_session(uri.getHost(), uri.getPort());
// Prepare and send request
string path(uri.getPathAndQuery());
Poco::Net::HTTPRequest req(Poco::Net::HTTPRequest::HTTP_GET,
path, Poco::Net::HTTPMessage::HTTP_1_1);
client_session.sendRequest(req);
// Get response
Poco::Net::HTTPResponse res;
std::istream& is = client_session.receiveResponse(res);
// Print to standard output
std::copy(std::istream_iterator<char>(is),
std::istream_iterator<char>(),
std::ostream_iterator<char>(std::cout));
} catch (Poco::Exception& e) {
std::cerr << "Exception: " << e.what() << std::endl;
return 1;
}
std::cout << "Completed communication";
return 0;
}
Thanks to my struggles getting the previous cpp-netlib example to build, I at least got very familiar with cmake. As a result, getting this example to build was a breeze:
cmake_minimum_required(VERSION 2.8)
project(hello-world)
add_definitions(-std=c++11)
# Search paths
include_directories(
/opt/boost/boost_1_54_0
/usr/local/include)
link_directories(
/opt/boost/boost_1_54_0/stage/lib
/usr/local/lib)
# Boost dependencies
find_package(Boost 1.51 REQUIRED system regex)
set(BOOST_LIBS
${Boost_SYSTEM_LIBRARY}
${Boost_REGEX_LIBRARY}
)
# Other external libraries
find_package(OpenSSL)
find_library(LIBCRYPTO crypto)
find_library(POCO_FOUNDATION PocoFoundation)
find_library(POCO_NET PocoNet)
set(EXTERNAL_LIBS
${OPENSSL_LIBRARIES}
${LIBCRYPTO}
${POCO_FOUNDATION}
${POCO_NET}
)
# Our final output
add_executable(hello-world hello-world.cpp)
target_link_libraries(hello-world
${BOOST_LIBS}
${EXTERNAL_LIBS})
And it worked fine too:
time ./hello-world http://www.google.com
<html><head><metahttp-equiv="content-type"content="text/html;charset= ...(skipped rest)
real 0m0.424s
user 0m0.004s
sys 0m0.012s
I'm sure I'll be using more of POCO in the future!