使用Boost Beast通过代理发出同步http请求时出现问题 [英] Problems making a sync http request through proxy using Boost Beast
本文介绍了使用Boost Beast通过代理发出同步http请求时出现问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我修改了http_sync示例以通过代理连接，我使用Wireshark进行了测试，问题是在我发送http连接请求后，代理返回代码200 OK，而我的程序无法读取它，它在等待http：：Read大约1分钟后就断开了与服务器的连接。 我试着绕过这一点，只是没有读取响应，但当我尝试进行SSL握手时，我得到了一个错误：未知协议(就Wireshark显示的情况而言，我的SSL握手会发送客户端问候，然后我会收到完整的服务器问候，但在此期间，我的程序会发送FIN，并给我错误，我认为这是因为他读取了200 OK，而不是服务器的答案，并感到困惑)。 所以我想我的问题是，有没有办法绕过这个问题？我不明白为什么http：：Read会出错。它在中间没有代理的情况下可以正常工作。 以下是我的代码：
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
namespace http = boost::beast::http; // from <boost/beast/http.hpp>
int main(int argc, char** argv)
{
try
{
// Check command line arguments.
auto const target = "www.discogs.com:443";
auto const host = "192.116.142.153";
auto const port = "443";
int version = 11;
// The io_context is required for all I/O
boost::asio::io_context ioc;
// These objects perform our I/O
ssl::context ctx{ ssl::context::sslv23_client };
load_root_certificates(ctx);
tcp::resolver resolver{ ioc };
ssl::stream<tcp::socket> stream{ ioc, ctx };
tcp::resolver::iterator sock = resolver.resolve("192.116.142.153", "8080");
boost::asio::connect(stream.next_layer(), sock);
http::request<http::string_body> req1{ http::verb::connect, target, version };
req1.set(http::field::host, target);
http::write(stream.next_layer(), req1);
boost::beast::flat_buffer buffer;
http::response<http::dynamic_body> res;
http::read(stream.next_layer(), buffer, res);
// Write the message to standard out
std::cout << res << std::endl;
// Perform the SSL handshake
stream.handshake(ssl::stream_base::client);
// Set up an HTTP GET request message
http::request<http::string_body> req{ http::verb::get, target, version };
req.set(http::field::host, host);
req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
// Send the HTTP request to the remote host
http::write(stream, req);
// This buffer is used for reading and must be persisted
//boost::beast::flat_buffer buffer;
// Declare a container to hold the response
//http::response<http::dynamic_body> res;
// Receive the HTTP response
http::read(stream, buffer, res);
// Write the message to standard out
std::cout << res << std::endl;
getchar();
// Gracefully close the stream
boost::system::error_code ec;
stream.next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_send);
if (ec == boost::asio::error::eof)
{
// Rationale:
// http://stackoverflow.com/questions/25587403/boost-asio-ssl-async-shutdown-always-finishes-with-an-error
ec.assign(0, ec.category());
}
if (ec)
throw boost::system::system_error{ ec };
// If we get here then the connection is closed gracefully
}
catch (std::exception const& e)
{
std::cerr << "Error: " << e.what() << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
推荐答案
在文档中搜索proxy使我跟踪skip()。这导致我使用我自己的响应解析器实例：
http::response<http::empty_body> res;
http::parser<false, http::empty_body> p(res);
p.skip(true);
http::read(stream.next_layer(), buffer, p);
这很管用。好的，我将请求目标更改为有效的。在本例中，我通过您的Fortinet代理检索了https://www.boost.org/users/license.html：
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/beast.hpp>
using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
namespace http = boost::beast::http; // from <boost/beast/http.hpp>
static void load_root_certificates(ssl::context &ctx);
int main() try {
// Check command line arguments.
auto const target = "www.boost.org:443";
auto const host = "www.boost.org";
int version = 11;
// The io_context is required for all I/O
boost::asio::io_context ioc;
// These objects perform our I/O
ssl::context ctx{ ssl::context::sslv23_client };
load_root_certificates(ctx);
tcp::resolver resolver{ ioc };
ssl::stream<tcp::socket> stream{ ioc, ctx };
stream.next_layer().connect({boost::asio::ip::address_v4::from_string("192.116.142.153"), 8080});
{
http::request<http::string_body> req1{ http::verb::connect, target, version };
req1.set(http::field::host, target);
http::write(stream.next_layer(), req1);
boost::beast::flat_buffer buffer;
http::response<http::empty_body> res;
http::parser<false, http::empty_body> p(res);
p.skip(true);
http::read(stream.next_layer(), buffer, p);
// Write the message to standard out
std::cout << res << std::endl;
}
// Perform the SSL handshake
stream.handshake(ssl::stream_base::client);
// Set up an HTTP GET request message
{
http::request<http::string_body> req{ http::verb::get, "/users/license.html", version };
req.set(http::field::host, host);
req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
// Send the HTTP request to the remote host
http::write(stream, req);
boost::beast::flat_buffer buffer;
http::response<http::dynamic_body> res;
http::read(stream, buffer, res);
// Write the message to standard out
std::cout << res << std::endl;
}
getchar();
// Gracefully close the stream
boost::system::error_code ec;
stream.next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_send);
if (ec == boost::asio::error::eof) {
// Rationale:
// http://stackoverflow.com/questions/25587403/boost-asio-ssl-async-shutdown-always-finishes-with-an-error
ec.assign(0, ec.category());
}
if (ec)
throw boost::system::system_error{ ec };
// If we get here then the connection is closed gracefully
} catch (std::exception const &e) {
std::cerr << "Error: " << e.what() << std::endl;
return EXIT_FAILURE;
}
namespace detail {
static void load_root_certificates(ssl::context &ctx, boost::system::error_code &ec) {
std::string const cert =
/* This is the DigiCert root certificate.
CN = DigiCert High Assurance EV Root CA
OU = www.digicert.com
O = DigiCert Inc
C = US
Valid to: Sunday, ?November ?9, ?2031 5:00:00 PM
Thumbprint(sha1):
5f b7 ee 06 33 e2 59 db ad 0c 4c 9a e6 d3 8f 1a 61 c7 dc 25
*/
"-----BEGIN CERTIFICATE-----
"
"MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
"
"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
"
"d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j
"
"ZSBFViBSb290IENBMB4XDTA2MTExMDAwMDAwMFoXDTMxMTExMDAwMDAwMFowbDEL
"
"MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3
"
"LmRpZ2ljZXJ0LmNvbTErMCkGA1UEAxMiRGlnaUNlcnQgSGlnaCBBc3N1cmFuY2Ug
"
"RVYgUm9vdCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMbM5XPm
"
"+9S75S0tMqbf5YE/yc0lSbZxKsPVlDRnogocsF9ppkCxxLeyj9CYpKlBWTrT3JTW
"
"PNt0OKRKzE0lgvdKpVMSOO7zSW1xkX5jtqumX8OkhPhPYlG++MXs2ziS4wblCJEM
"
"xChBVfvLWokVfnHoNb9Ncgk9vjo4UFt3MRuNs8ckRZqnrG0AFFoEt7oT61EKmEFB
"
"Ik5lYYeBQVCmeVyJ3hlKV9Uu5l0cUyx+mM0aBhakaHPQNAQTXKFx01p8VdteZOE3
"
"hzBWBOURtCmAEvF5OYiiAhF8J2a3iLd48soKqDirCmTCv2ZdlYTBoSUeh10aUAsg
"
"EsxBu24LUTi4S8sCAwEAAaNjMGEwDgYDVR0PAQH/BAQDAgGGMA8GA1UdEwEB/wQF
"
"MAMBAf8wHQYDVR0OBBYEFLE+w2kD+L9HAdSYJhoIAu9jZCvDMB8GA1UdIwQYMBaA
"
"FLE+w2kD+L9HAdSYJhoIAu9jZCvDMA0GCSqGSIb3DQEBBQUAA4IBAQAcGgaX3Nec
"
"nzyIZgYIVyHbIUf4KmeqvxgydkAQV8GK83rZEWWONfqe/EW1ntlMMUu4kehDLI6z
"
"eM7b41N5cdblIZQB2lWHmiRk9opmzN6cN82oNLFpmyPInngiK3BD41VHMWEZ71jF
"
"hS9OMPagMRYjyOfiZRYzy78aG6A9+MpeizGLYAiJLQwGXFK3xPkKmNEVX58Svnw2
"
"Yzi9RKR/5CYrCsSXaQ3pjOLAEFe4yHYSkVXySGnYvCoCWw9E1CAx2/S6cCZdkGCe
"
"vEsXCS+0yx5DaMkHJ8HSXPfqIbloEpw8nL+e/IBcm2PN7EeqJSdnoDfzAIJ9VNep
"
"+OkuE6N36B9K
"
"-----END CERTIFICATE-----
"
/* This is the GeoTrust root certificate.
CN = GeoTrust Global CA
O = GeoTrust Inc.
C = US
Valid to: Friday, May 20, 2022 9:00:00 PM
Thumbprint(sha1):
de 28 f4 a4 ff e5 b9 2f a3 c5 03 d1 a3 49 a7 f9 96 2a 82 12
*/
"-----BEGIN CERTIFICATE-----
"
"MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
"
"MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
"
"d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j
"
"ZSBFViBSb290IENBMB4XDTA2MTExMDAwMDAwMFoXDTMxMTExMDAwMDAwMFowbDEL
"
"MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3
"
"LmRpZ2ljZXJ0LmNvbTErMCkGA1UEAxMiRGlnaUNlcnQgSGlnaCBBc3N1cmFuY2Ug
"
"RVYgUm9vdCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMbM5XPm
"
"+9S75S0tMqbf5YE/yc0lSbZxKsPVlDRnogocsF9ppkCxxLeyj9CYpKlBWTrT3JTW
"
"PNt0OKRKzE0lgvdKpVMSOO7zSW1xkX5jtqumX8OkhPhPYlG++MXs2ziS4wblCJEM
"
"xChBVfvLWokVfnHoNb9Ncgk9vjo4UFt3MRuNs8ckRZqnrG0AFFoEt7oT61EKmEFB
"
"Ik5lYYeBQVCmeVyJ3hlKV9Uu5l0cUyx+mM0aBhakaHPQNAQTXKFx01p8VdteZOE3
"
"hzBWBOURtCmAEvF5OYiiAhF8J2a3iLd48soKqDirCmTCv2ZdlYTBoSUeh10aUAsg
"
"EsxBu24LUTi4S8sCAwEAAaNjMGEwDgYDVR0PAQH/BAQDAgGGMA8GA1UdEwEB/wQF
"
"MAMBAf8wHQYDVR0OBBYEFLE+w2kD+L9HAdSYJhoIAu9jZCvDMB8GA1UdIwQYMBaA
"
"FLE+w2kD+L9HAdSYJhoIAu9jZCvDMA0GCSqGSIb3DQEBBQUAA4IBAQAcGgaX3Nec
"
"nzyIZgYIVyHbIUf4KmeqvxgydkAQV8GK83rZEWWONfqe/EW1ntlMMUu4kehDLI6z
"
"eM7b41N5cdblIZQB2lWHmiRk9opmzN6cN82oNLFpmyPInngiK3BD41VHMWEZ71jF
"
"hS9OMPagMRYjyOfiZRYzy78aG6A9+MpeizGLYAiJLQwGXFK3xPkKmNEVX58Svnw2
"
"Yzi9RKR/5CYrCsSXaQ3pjOLAEFe4yHYSkVXySGnYvCoCWw9E1CAx2/S6cCZdkGCe
"
"vEsXCS+0yx5DaMkHJ8HSXPfqIbloEpw8nL+e/IBcm2PN7EeqJSdnoDfzAIJ9VNep
"
"+OkuE6N36B9K
"
"-----END CERTIFICATE-----
";
ctx.add_certificate_authority(boost::asio::buffer(cert.data(), cert.size()), ec);
if (ec)
return;
}
} // namespace detail
static void load_root_certificates(ssl::context &ctx) {
boost::system::error_code ec;
detail::load_root_certificates(ctx, ec);
if (ec)
throw boost::system::system_error{ ec };
}
打印
HTTP/1.1 200 OK
HTTP/1.1 200 OK
Date: Sun, 15 Apr 2018 00:32:52 GMT
Server: Apache/2.2.15 (CentOS)
Accept-Ranges: bytes
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
8ee3
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>Boost Software License</title>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii" />
<link rel="icon" href="/favicon.ico" type="image/ico" />
<link rel="stylesheet" type="text/css" href="../style-v2/section-boost.css" />
<!--[if IE 7]> <style type="text/css"> body { behavior: url(/style-v2/csshover3.htc); } </style> <![endif]-->
</head><!--
Note: Editing website content is documented at:
https://www.boost.org/development/website_updating.html
-->
<body>
<div id="heading">
<div class="heading-inner">
<div class="heading-placard"></div>
<h1 class="heading-title">
<a href="/">
<img src="/gfx/space.png" alt= "Boost C++ Libraries" class="heading-logo" />
<span class="heading-boost">Boost</span>
<span class="heading-cpplibraries">C++ Libraries</span>
</a></h1>
<p class="heading-quote">
<q>...one of the most highly
regarded and expertly designed C++ library projects in the
world.</q> <span class="heading-attribution">— <a href=
"http://www.gotw.ca/" class="external">Herb Sutter</a> and <a href=
"http://en.wikipedia.org/wiki/Andrei_Alexandrescu" class="external">Andrei
Alexandrescu</a>, <a href=
"http://safari.awprofessional.com/?XmlId=0321113586" class="external">C++
Coding Standards</a></span></p>
</div>
</div>
<div id="body">
<div id="body-inner">
<div id="content">
<div class="section" id="intro">
<div class="section-0">
<div class="section-title">
<h1>Boost Software License</h1>
</div>
<div class="section-body">
<ul class="toc">
<li><a href="../LICENSE_1_0.txt">License text</a></li>
(剩余部分被剪断)
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