Getting "broken pipe" errors when using larger payloads
```
Environment: ubuntu 16.04 VM on a Windows 10 host
I am using Simple Web Server code - latest from master branch (last commit f59906cc)
I have a pair of http server/client apps using both pieces from Simple Web Server code.
I am getting "Broken pipe" error, every now and then when the payload size is larger - in my case it is around 50KB. A subsequent retry works fine.
I see no issues when I have a smaller payload size of say 200 bytes.
```
Here are some debug logs (that I added in server_http.hpp and client_http.hpp) for larger payload case:
```
Jan 31 16:11:30 vibe[26956]: [.172797] INFO: sending POST request of size 53010 bytes to sss service
Jan 31 16:11:30 vibe[26956]: [.173027] INFO: client_http.hpp: request:208
Jan 31 16:11:30 vibe[26956]: [.173219] INFO: client_http.hpp: request:276
Jan 31 16:11:30 vibe[26956]: [.174263] INFO: client_http.hpp: request:334: calling connect from request(): content={ "readings" : ...
Jan 31 16:11:30 vibe[26956]: [.174632] INFO: client_http.hpp: write:538: Calling asio::async_write, connection=0x7fc06c00fda0
Jan 31 16:11:30 vibe[26956]: [.174842] INFO: ------ client_http.hpp: async_write callback:548: async_write callback: Error on connection during asio::async_write, connection open=true, connection=0x7fc06c00fda0
Jan 31 16:11:30 vibe[26956]: [.174991] INFO: ------ client_http.hpp: request(): session callback:283: ec=error_code: value=32, category().name()=system, message()=Broken pipe
Jan 31 16:11:30 vibe[26956]: [.175123] INFO: client_http.hpp: operator():297: request(): session callback: deleting connection, connection=0x7fc06c00fda0
Jan 31 16:11:30 vibe[26956]: [.175260] INFO: client_http.hpp: operator():314: request(): session callback: Calling request_callback()
Jan 31 16:11:30 vibe[26956]: [.175406] INFO: client_http.hpp: request:224
Jan 31 16:11:30 vibe[26956]: [.175624] ERROR: Failed to append readings: Broken pipe
Jan 31 16:11:30 vibe[26956]: [.175795] WARNING: Failed to write readings to sss layer, queue for resend
Jan 31 16:11:30 vibe[26956]: [.176134] INFO: client_http.hpp: request:208
Jan 31 16:11:30 vibe[26956]: [.176253] INFO: client_http.hpp: request:276
Jan 31 16:11:30 vibe[26956]: [.176269] INFO: client_http.hpp: request:334: calling connect from request(): content={ "updates" : ...
Jan 31 16:11:30 vibe[26956]: [.176277] INFO: client_http.hpp: write:538: Calling asio::async_write, connection=0x7fc064002860
Jan 31 16:11:30 vibe[26956]: [.176404] INFO: client_http.hpp: operator():686: calling connect from read(): async_read_until callback
Jan 31 16:11:30 vibe[26956]: [.176520] INFO: ++++++ client_http.hpp: operator():842: async_resolve done, calling asio::async_connect,
Jan 31 16:11:30 vibe[26956]: [.176591] INFO: ++++++ client_http.hpp: operator():852: async_connect done, connection=0x7fc064002860
Jan 31 16:11:30 vibe[26956]: [.176598] INFO: client_http.hpp: write:538: Calling asio::async_write, connection=0x7fc064002860
Jan 31 16:11:30 vibe[26956]: [.179487] INFO: client_http.hpp: operator():314: request(): session callback: Calling request_callback()
Jan 31 16:11:30 vibe[26956]: [.179511] INFO: client_http.hpp: request:224
Jan 31 16:11:30 vibe[26956]: [.181357] INFO: sending POST request of size 53010 bytes to sss service
Jan 31 16:11:30 vibe[26956]: [.181382] INFO: client_http.hpp: request:208
Jan 31 16:11:30 vibe[26956]: [.181407] INFO: client_http.hpp: request:276
Jan 31 16:11:30 vibe[26956]: [.182267] INFO: client_http.hpp: request:334: calling connect from request(): content={ "readings" : ...
Jan 31 16:11:30 vibe[26956]: [.182458] INFO: ++++++ client_http.hpp: operator():842: async_resolve done, calling asio::async_connect,
Jan 31 16:11:30 vibe[26956]: [.182544] INFO: ++++++ client_http.hpp: operator():852: async_connect done, connection=0x7fc06c0008d0
Jan 31 16:11:30 vibe[26956]: [.182552] INFO: client_http.hpp: write:538: Calling asio::async_write, connection=0x7fc06c0008d0
Jan 31 16:11:30 vibe[26956]: [.188823] INFO: client_http.hpp: operator():314: request(): session callback: Calling request_callback()
Jan 31 16:11:30 vibe[26956]: [.188855] INFO: client_http.hpp: request:224
Jan 31 16:11:30 vibe[26956]: [.188862] INFO: POST response: 200 OK
```
Please let me know your thoughts on this. And what can I try further to understand & debug this issue.
issue
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