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Embeddable C++ HTTP server

License: Boost Software License 1.0

C++ 99.83% CMake 0.17%

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example build failure with cmake and multiple boost versions

I build on gentoo with my custom boost installed into /usr/local. I have also system built boost in /usr.
To compile example I needed to add this line to CMakeLists.txt:

link_directories(${Boost_LIBRARIES_DIRS})

just before target_link_libraries.

segfault when `handler` called before `result.get()`

If the following async_foobar is available:

template<class CompletionToken>
typename asio::async_result<
    typename asio::handler_type<CompletionToken,
                                void(system::error_code)>::type>::type
async_foobar(CompletionToken &&token)
{
    typedef typename asio::handler_type<
        CompletionToken, void(system::error_code)>::type Handler;

    Handler handler(std::forward<CompletionToken>(token));
    asio::async_result<Handler> result(handler);

    // handler not scheduled (i.e. called before `result.get()`)
    handler(system::error_code());
    return result.get();
}

And called within the following context:

#include <cstdlib>

#include <boost/asio/io_service.hpp>
#include <boost/asio/spawn.hpp>

using namespace std;
using namespace boost;

int main(int argc, char *argv[])
{
    asio::io_service ios;

    auto work = [](asio::yield_context yield) {
        while (true) {
            try {
                async_foobar(yield);
            } catch (std::exception &e) {
                cerr << "Aborting on exception: " << e.what() << endl;
                std::exit(1);
            }
        };
    };

    spawn(ios, work);
    ios.run();
    return 0;
}

The program will segfault (not even an exception is throw or anything). The debug output follows:

vinipsmaker ~ $ clang++ test.cpp -std=c++11 -lboost_system -lboost_coroutine -g
vinipsmaker ~ $ gdb a.out 
GNU gdb (GDB) 7.8
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from a.out...done.
(gdb) run
Starting program: /home/vinipsmaker/a.out 
Got object file from memory but can't read symbols: File truncated.
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ff7d48 in ?? ()
(gdb) backtrace
#0  0x00007ffff7ff7d48 in ?? ()
#1  0x00007ffff7ff7d48 in ?? ()
#2  0x00007fffffffe548 in ?? ()
#3  0x00007ffff7ff7da0 in ?? ()
#4  0x0000000000406383 in boost::asio::detail::coro_entry_point<boost::asio::detail::wrapped_handler<boost::asio::io_service::strand, void (*)(), boost::asio::detail::is_continuation_if_running>, main::$_0&>::operator()(boost::coroutines::coroutine<void (), 0>&) (this=0x7ffff7ff7e70, ca=...)
    at /usr/include/boost/asio/impl/spawn.hpp:248
#5  0x000000000043cc00 in ?? ()
#6  0x00007ffff7ff7e70 in ?? ()
#7  0x000000000043c8c0 in ?? ()
#8  0x0000000000000000 in ?? ()
(gdb) frame 4
#4  0x0000000000406383 in boost::asio::detail::coro_entry_point<boost::asio::detail::wrapped_handler<boost::asio::io_service::strand, void (*)(), boost::asio::detail::is_continuation_if_running>, main::$_0&>::operator()(boost::coroutines::coroutine<void (), 0>&) (this=0x7ffff7ff7e70, ca=...)
    at /usr/include/boost/asio/impl/spawn.hpp:248
248           (data->function_)(yield);
(gdb) l
243         {
244           shared_ptr<spawn_data<Handler, Function> > data(data_);
245           ca(); // Yield until coroutine pointer has been initialised.
246           const basic_yield_context<Handler> yield(
247               data->coro_, ca, data->handler_);
248           (data->function_)(yield);
249           if (data->call_handler_)
250             (data->handler_)();
251         }
252

This problem needs to be investigated! It's very important because some errors are detected sooner and are being propagated before result.get() is called.

Memory management

boost::http::basic_socket should be able to receive some parser_traits. Such parser_traits should allow us to limit maximum HTTP header key and value sizes and it should also allow to limit number of headers as well as maximum body size. The point is that should be possible to avoid reallocations and leave memory management for the user. Other useful options are strict/liberal parser, predicate to decide whether header should be stored (blacklist wouldn't work)...
Expanding on the above item, there should be a portable interface among sockets to dictate maximum size for some HTTP elements. basic_socket should implement it. Other backends may not (On the non-hacky front).
Further tune Message concept to allow an implementation that will drop info at insertion time instead relying on C++11's container concepts. Text should be in the lines of something like "this operation potentially insert an element...". (How could a user provide a message concept that satifies the SequenceContainer for the body avoid memory allocations?...).
Fix vector capacity tuning.
Remove all (implicitly) allocating code (e.g. last_header).

Others

Provide a HTTP parser. This way, user can benefit even if he won't use Asio.
Provide algorithm that will create a HTTP raw stream (represented as a string) from a HTTP message. Also provide a "literal message" of some sort that is created using literal strings and return a const value of an unspecified type that models the Message concept.
Implement HTTP/2.0
Friendlier interface. It should be addressed with a request router and better documentation that makes use of such router.
Provide algorithms to remove boilerplate on reading messages (http::completions::full(message_) is a functor).

WON'T FIX

Make boost::http::socket closer to Asio's socket. The suggestion wasn't developed enough.
Generator/parser design (Using the buffer/view approach..., The problem is that you'd have to keep the headers...).
http::stream. Actually, it won't be done for the next Boost submission, but I might (or might not) add it later.

Documentation/examples

How to fetch the contents of a website given a URL.
How to make a static page server.
How to write code that handles a POST or GET request dynamically based on specified parameters.
How to write a server that accepts file uploads.
HTTP/2.0
Websockets

Others

There should be more high-level components.
Client side
"I would also like to see instances of this library being used in production. That would give some evidence that the design works in practice."

I believe this would be interesting to many people. Consider adding this to the Boost Library Incubator (www.blincubator.com) To do this, all you'd have to do is make a couple minor adjustments in directory layout and provide browsable html documentation.

Robert Ramey

Rodrigo Madera's review

Header only
C++98
Needs higher-level abstractions
Benchmark. Should also compare against Asio examples of HTTP servers.
More examples.
Improve tutorials. Maybe use ASIO as a reference/inspiration.
HTTP/2.0
"You should send a 100-continue to ask for the rest of the body if
required."

It shouldn't be required. It's boilerplate in most cases.

Lee Clagett's review

There is no built-in mechanism for writing out client headers, which means there is no client support.

I would expect a boost::http library to be more feature complete before being accepted.
Why aren't there higher-order functions for more common use cases?
A std::ostringstream is used, when spirit::karma would be faster and have less memory allocations (minor).
If a user want the write_header API, I'd be on top of current API as a separate abstraction (ResponseBuilder?)...
update the requirements to better reflect the state...
Provide an HTTP parser, as it's the only thing some users care about.

Specification/type-requirements

"async_writeandasync_read_some` in the http::Socket concept requires an entire http::Message concept as an argument, when only the SequenceContainer concept should be necessary for this function" (TODO: decrease requirements and add a few helper functions/types).
"It might be worth eventually relaxing the requirements for the key/values in the AssociativeMap used by the field parsing functions to a subset of string functions. begin(), end(), size(), empty(), push_back(), pop_back(), operator<(), a hash implementation, and contigous data. This way a quick and dirty small string optimization could be written for field handling."
"The current async_write_response implementation assumes contiguous elements on the SequenceContainer concept, which is incorrect."

The error on the implementation happens because the implementation converts the body to an asio::buffer. asio::buffer requires contiguous elements. Message concept only requires SequenceContainer.

A solution could be requiring contiguous elements also within the Message concept.
More considerations for design choices (or documentation wording) should be considered - All data reads / writes for the message body require a copy to be made.
"How do the various write functions manipulate the headers? What fields are added, if any? This is partially mentioned at the bottom of the http::ServerSocket page, but I saw "content-length: 22" added to my message, and this was never explicitly stated (although obviously assumed). This should likely be explicitly specified in the concept itself, AND the location should be specified (i.e. these fields are explicitly appended). Should also document that some fields, such as content-length cannot be listed twice according to the specification, while comma de-limited fields can be listed multiple times as a valid form of appension. I.e. "content-encoding: gzip, sdch\r\n" and "content-encoding: gzip\r\ncontent-encoding: sdch\r\n" indicate equivalent content encodings applied to the data. Should probably mention that Transfer-Encoding is a comma delimited list too."
"The key_type and mapped_type for the headers portion of the message::Concept indicate that they must meet the "String concept". I don't recall seeing this concept being defined in C++ or boost, where does it come from? If its from C++1z, it might be to merge the behavior of string_ref and basic_string, so that concept would be unlikely to require storage like a container. Might want to re-think the concept requirements here, or state that only a conforming std::basic_string implementation is acceptable for now."

pipelining and implicit writes

I agree that documentation needs improvement here too.
Documentation on http::socket being able to write "implicitly" (The ServerSocket concept gives guarantees about a producer to HTTP messages...).
"http::SocketServer implementations manipulate the state of the http::Socket (and indirectly the asio::tcp::socket), making some actions unavailable after invoking those functions. For example, after invoking async_write_response, no writes on the http::Socket/http::ServerSocket or asio::ip::tcp::socket can occur until the callback is invoked because it calls asio::write on the asio::ip::tcp::socket directly. So unless I am incorrect, it is important for the users to know whats being manipulated (the effects)."
"issuing an async_read_some command blocks both the send and receive channels of the underlying ASIO stream"
- "This is not documented anywhere"
- reason is "current async_read_some implementation has an error code path that can initiate a write"
- Actually, it's already forbidden to issue a read while write hasn't finished, but user could try to use its own parser to read next request. So documentation must clarify this implementation detail. Something in the lines of "never do raw read/writes with the native handle". Pay attention to WebSocket (e.g. user should be able to borrow a "clean" handle during UPGRADE).

Excessive writes for response headers

Running a unit-test, I noticed that for every header, the header name and the header value as well as the \r\n at the end would result in three separate writes. This means three Kernel-Space/User-Space switches for each single header.

Add a test to ODR violations

It'll prevent this issue from reappearing: #44

Specify max header and URL in request line lengths

I think that good security enhancement would be some max lengths configurations:

maximum length of URL in request line
maximum length of header's name and header's value

These are possible attack surfaces.

using template<typename Handler> instead of boost::function

and make the library header only.

[fileserver] coalesce any of the ranges that overlap

Coalesce any of the ranges that overlap, or that are separated by a gap that is smaller than the overhead of sending multiple parts.

Niall Douglas's review

Hints

See http://www.python-requests.org/en/latest/api/ for HTTP client
Ideas to write examples and to benchmark
- Implementing an ICAP filter for Squid. See http://wiki.squid-cache.org/Features/ICAP. Let's say it prepends to the <title> tag content something funny.
- Bjorn has probably also mentioned this, but the world's simplest WebDAV server (https://en.wikipedia.org/wiki/WebDAV) serving a single read-only file called HelloWorld.txt would be great. Being able to mount your HTTP library as a Windows or Linux drive is simply cool.

WON'T FIX

Boost-less version of Boost.Http.
Explain why Boost.Http uses Asio.

Limit the size of requests

As a security measure, we need to limit the amount of bytes per request, so an attacker cannot, easily, perform a DoS attack by simply sending and excessive number of headers or multiple-gigabyte requests.

Ideally, a preset limit in the number of HTTP-Headers that the parser will receive before dropping the request can be implemented. The user could optionally pass a custom limit when instantiating the template.

Use uppercase first letter in HTTP header keys

Any HTTP server I know (but, honestly, I don't know many) use uppercase first letters in HTTP header keys (e.g., 'Transfer-Encoding' rather than 'transfer-encoding').

SSL Handshake Timeout

SSL handshake timeout should be configurable.

Compile error, Visual Studio

I ran CMake on the test directory, opened up the solution, and tried to build. I get this error in many places:

2>D:\lib\boost_1_61_0\boost/asio/detail/socket_types.hpp(24): fatal error C1189: #error: WinSock.h has already been included

`async_read_until(full_message_unsafe)`

One for each step the user want to read (metadata...). The API should handle 100-continue for the user. Also, remember to add full_message_if_safe version that only will read the body if "content-length" is previously know. Names aren't set in stone and can change, but the name unsafe should be used to discourage users to use memory-exhausting APIs.

Port to Boost.Beast?

Any plans to port this project to use Boost.Beast?

Enable OS X under Travis

I already got permission, but it isn't enabled yet.

Branch renaming

As the parser is the new main attraction from the library, I'm gonna rename branches. So this is a warning in case you've cloned the repo.

I intend to submit the parser library to Boost review once I finish the remaining two features (maybe three) I have in my backlog. The parser library was developed with no trace history of the master branch (i.e. orphan branch). I'm not submitting the current master branch to review. Therefore, the current branch layout would cause confusion and I'm handling this problem now.

The plan

master -> socket
parser -> master

All commits in parser are already in master (I regularly do git merge parser from master branch, as the parser is used in the larger library), then I cannot force an error if you forget to manually update your copy of the respository. Therefore, to force such error, I'll do the following two changes now:

Copy branch master to socket.
Create an orphan branch to replace master which will just have a README.adoc explaining the change. If you missed this notice and just run git pull, you should get an error and eventually reach this issue to understand what's going on.

After three weeks, I'll replace the master branch with the parser branch. I'll maintain the branch parser for another three weeks (plenty of window time-space to upgrade your projects).

Tom Kent's review

"a set of convenience functions that could replace most of the boilerplate that is in the tutorial."
Bjam
C++03/98
Header only and compiled library
HTTP2
"I think the documentation needs serious work. The only example is very long and drawn out. The first example should be something a user can get running in a few lines of code, not a full page. There should also be more examples of how to integrate the http service with getting files from the file system, generating responses CGI-style, supporting TLS (is this a feature? If not this would be a show-stopper), etc."

Less important items

Cookies
Forms/File Uploads

Add <boost/iostreams/filter/gzip.hpp> support

A basic feature of most HTTP request is the use of compression of post and response bodies. We need to implement some way of performing gzip compression and decompression.

Ideally, allow for custom compressors to be used also.

Darren Cook's review

Better documentation, better marketed and much more examples.
High-level API.
Header-only
A built-in router.
Benchmarks.

I would like to see CPU and memory usage benchmarks; ideally on reference hardware such as an Amazon EC2 instance. Realistic examples such as: a simple file server, a file-server that is doing substitution/modification of the files being read, and a chat server. This is because artificial benchmarks often encourage making the design harder to use for the sake of a few microseconds. I'd rather have a server, doing real work, that can support 499 clients/second than one that can support 500 clients/second but requires me to write twice as much code.

About `HttpClient`

Good inspirations:

cURL.
PHP's file_get_contents.

WON'T FIX

It should be called Boost.HttpServer; and then there should be another library called Boost.HttpClient.

Header-only HTTP parser

Build an HTTP parser that is header-only and don't need separate compilation.

Roland Bock's review

offers both client and server side
offers a high level interface that allows me to get started very quickly, without having to worry about the gory details
offers tons of ways to tune, in case I feel the need to do that
supports HTTP/1 through HTTP/2
more documentation (and probably a different tutorial). More examples are required. A few short ones especially.
Some more advanced examples, e.g. including TLS with client/server certificates would help.

documentation with ability for users to post comments

http://lists.boost.org/Archives/boost/2015/06/223226.php

jwaterloo's review

more documentation and detailed examples of these polymorphic adapters
HTTP/2.0

Improve documentation

Change algorithms to take predicate by value

This change will allow predicates with non-const methods like the following one:

struct P
{
  bool operator()(boost::string_ref /*v*/)
  {
    ++c;
  }
  unsigned c = 0;
}

Also, it's the approach used by std::*'s algorithms.

TODO

HTTP client side

TODO, research:

cURL
PHP's file_get_contents
serf
urllib3
Node.JS
Qt's network classes
JavaScript/HTML5
Firefox source code
Chromium source code
ruby-httpclient
python's requests
http://www.webdav.org/neon/
libsoup

Allow empty field values

Client APIs may want to send valid request messages with an empty host. To do so, it's essential to allow empty field values.

An initial reference to this problem: https://lists.w3.org/Archives/Public/ietf-http-wg/2013JanMar/1249.html

RFC7230 mention this requirement as well.

Currently this behaviour is forbidden in a few places:

`"Content-Range"` mini-parser

could boost context be optional

could boost context be optional
on mingw, context is not built by default because context requires masm to be on the path
...
I was able to work around this issue by getting masm and rebuilding boost but is MASM is optional, than context is option in boost and as such should preferably be optional in any libraries that bepend upon it

Build failing with boost 1.56

Tried building your library with boost 1.56 installed on my system, but it had trouble resolving the overloaded constructors in flat_multimap in the socket tests.

Took a look through the boost docs, and on 1.56, there's no initializer_list constructor for flat_multimap. That constructor first appears in 1.57.

It'd be helpful to have a note in your readme detailing the minimum boost version required to build your library. I know if/when this library is approved for boost inclusion, it'll be at a version where the minimum requirements are met, but for people trying out your library with a system boost installed, it's nice to know if an upgrade is necessary or not.

Fix AppVeyor

CMake is failing to find compiler: https://ci.appveyor.com/project/vinipsmaker/boost-http/build/1.0.135/job/o4chy4u201n7vakp#L665

Enable clang's MemorySanitizer within CI

On a previous Boost release, it was failing under use-of-uninitialized-value: https://svn.boost.org/trac/boost/ticket/11425#comment:2

Benchmarking

Hints for a start:

https://github.com/wg/wrk

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\JWATERLOO>cd C:\Tutorials\C++\boost.http\build

C:\Tutorials\C++\boost.http\build>mingw32-make
[ 23%] Built target boost_http
[ 28%] Linking CXX executable algorithm.exe
CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x442
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0xcba
): undefined reference to `_imp___ZN5boost9unit_test15unit_test_log_t14set_check
pointENS0_13basic_cstringIKcEEjS4_'
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): undefined reference to `_imp___ZN5boost10test_tools9tt_detail10check_implERKN
S0_16predicate_resultERKNS_9unit_test12lazy_ostreamENS5_13basic_cstringIKcEEjNS1
_10tool_levelENS1_10check_typeEjz'
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x4af
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x521
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x586
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x5eb
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x650
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x6a9
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x6b5
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x70e
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x71a
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x752
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x75d
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0xd11
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0xd1c
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x12c
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x12d
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x188
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x189
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x196
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x197
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1a8
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1a8
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KNS0_16predicate_resultERKNS_9unit_test12lazy_ostreamENS5_13basic_cstringIKcEEjN
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1bc
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1bd
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1c6
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1c8
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1e7
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1f3
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1f6
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1f6
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1f6
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x1f9
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x209
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x20a
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x210
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text+0x211
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text.start
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text.start
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text.start
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text.start
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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CMakeFiles\algorithm.dir/objects.a(algorithm.cpp.obj):algorithm.cpp:(.text$_ZN5b
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../libboost_http.a(socket.cpp.obj):socket.cpp:(.text+0x52): undefined reference
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../libboost_http.a(socket.cpp.obj):socket.cpp:(.text+0x81): undefined reference
to `_imp__WSAStartup@8'
collect2.exe: error: ld returned 1 exit status
test\CMakeFiles\algorithm.dir\build.make:103: recipe for target 'test/algorithm.
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mingw32-make[2]: *** [test/algorithm.exe] Error 1
CMakeFiles\Makefile2:1079: recipe for target 'test/CMakeFiles/algorithm.dir/all'
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mingw32-make[1]: *** [test/CMakeFiles/algorithm.dir/all] Error 2
makefile:137: recipe for target 'all' failed
mingw32-make: *** [all] Error 2

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