example/async1.cpp doesn't detect EOF and thus is running forever.

[Corristo]

I'm trying to get the async example to run on my machine, and unfortunately it just keeps running forever. I added std::cout statements to each of the web_page_getter private member functions to track progress, and now when running it I'm presented with the following output:

connecting...
sending request...
reading headers...
reading body...

I captured the network traffic generated by the executable with wireshark, and it shows that the entire body has been submitted, yet the program doesn't finish execution. As a sanity check I've also tested example/sync2.cpp, which works just fine.

I've compiled the example on my laptop running Arch linux with both gcc 7.1.1 and clang 4.0.1, with c++14 and c++17 flags and tried both libc++ and libstdc++, but it always has the same behaviour. Any suggestion on how to fix this?

Compiler output:

[manuel@Thinkpad-L440 examples (master *%=)]$ clang++ -std=c++14 -stdlib=libc++ -lpthread -I ../networking-ts-impl-master/include/ -v -g async1.cpp 
clang version 4.0.1 (tags/RELEASE_401/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-pc-linux-gnu/7.1.1
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/7.1.1
Found candidate GCC installation: /usr/lib64/gcc/x86_64-pc-linux-gnu/7.1.1
Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/usr/bin/clang-4.0" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name async1.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -v -dwarf-column-info -debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb -resource-dir /usr/bin/../lib/clang/4.0.1 -I ../networking-ts-impl-master/include/ -internal-isystem /usr/bin/../include/c++/v1 -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/clang/4.0.1/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /home/manuel/Entwicklung/Cpp/cppnow-2017-networking-ts-workshop/examples -ferror-limit 19 -fmessage-length 227 -stack-protector 2 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/async1-4ee192.o -x c++ async1.cpp
clang -cc1 version 4.0.1 based upon LLVM 4.0.1 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 ../networking-ts-impl-master/include
 /usr/bin/../include/c++/v1
 /usr/local/include
 /usr/bin/../lib/clang/4.0.1/include
 /usr/include
End of search list.
 "/usr/bin/ld" -pie --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../lib64/Scrt1.o /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../lib64/crti.o /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/crtbeginS.o -L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1 -L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../lib64 -L/usr/bin/../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../.. -L/usr/bin/../lib -L/lib -L/usr/lib -lpthread /tmp/async1-4ee192.o -lc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/crtendS.o /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/7.1.1/../../../../lib64/crtn.o

GDB backtrace

#0  0x00007ffff7bc81ad in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007ffff79381cf in std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) () from /usr/lib/libc++.so.1
#2  0x00007ffff793b2db in std::__1::__assoc_sub_state::__sub_wait(std::__1::unique_lock<std::__1::mutex>&) () from /usr/lib/libc++.so.1
#3  0x000055555557de03 in std::__1::__assoc_state<std::__1::tuple<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > >::move (this=0x55555578b4e0) at /usr/bin/../include/c++/v1/future:691
#4  0x000055555555bbcc in std::__1::future<std::__1::tuple<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > >::get (this=0x7fffffffe898) at /usr/bin/../include/c++/v1/future:1177
#5  0x00005555555599a4 in main () at async1.cpp:145

Note: async1.cpp:145 is the line auto result = f.get().