Am I doing it wrong or is it a bug in net/http?

StackOverflow https://stackoverflow.com/questions/18595233

Pregunta

I'm using Ruby Net::HTTP under a NginX/Phusion Passenger server, attempting to POST a JSON string to the server. It appears that my POST, only when sending as 'application/json', prematurely closes the session to the server. I.E.:

On the server side:

127.0.0.1 - - [03/Sep/2013 07:47:14] "POST /path/to/submit " 200 45 0.0013
pid=12893 thr=47197563169088 file=ext/nginx/HelperAgent.cpp:933 time=2013-09-03 07:47:14.830 ]: Uncaught exception in PassengerServer client thread:
exception: Cannot read response from backend process: Connection reset by peer (104)
backtrace:
 in 'void Client::forwardResponse(Passenger::SessionPtr&, Passenger::FileDescriptor&, const Passenger::AnalyticsLogPtr&)' (HelperAgent.cpp:698)
 in 'void Client::handleRequest(Passenger::FileDescriptor&)' (HelperAgent.cpp:859)
 in 'void Client::threadMain()' (HelperAgent.cpp:952)

A client side debug session is:

opening connection to hostname.com...
opened
<- "POST /path/to/submit HTTP/1.1\r\nContent-Type: application/json\r\nAccept: application/json\r\nUser-Agent: agent+test\r\nConnection: close\r\nHost: hostname.com\r\nContent-Length: 660\r\n\r\n"
<- "[{json string}]"
-> "HTTP/1.1 301 Moved Permanently\r\n"
-> "Server: nginx/1.2.6\r\n"
-> "Date: Tue, 03 Sep 2013 14:47:15 GMT\r\n"
-> "Content-Type: text/html\r\n"
-> "Content-Length: 184\r\n"
-> "Connection: close\r\n"
-> "Location: https://hostname.com/path/to/submit\r\n"
-> "\r\n"
reading 184 bytes...
-> "<html>\r\n<head><title>301 Moved Permanently</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>301 Moved Permanently</h1></center>\r\n<hr><center>nginx/1.2.6</center>\r\n</body>\r\n</html>\r\n"
read 184 bytes
Conn close
opening connection to hostname.com...
opened
<- "POST /path/to/submit HTTP/1.1\r\nContent-Type: application/json\r\nAccept: application/json\r\nUser-Agent: agent+test\r\nConnection: close\r\nHost: hostname.com\r\nContent-Length: 660\r\n\r\n"
<- "[{json string}]"
-> "HTTP/1.1 200 OK\r\n"
-> "Content-Type: text/html;charset=utf-8\r\n"
-> "Content-Length: 45\r\n"
-> "Connection: close\r\n"
-> "Status: 200\r\n"
-> "X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 3.0.17\r\n"
-> "X-Frame-Options: SAMEORIGIN\r\n"
-> "X-XSS-Protection: 1; mode=block\r\n"
-> "X-Content-Type-Options: nosniff\r\n"
-> "Server: nginx/1.2.6 + Phusion Passenger 3.0.17 (mod_rails/mod_rack)\r\n"
-> "Strict-Transport-Security: max-age=31536000\r\n"
-> "X-Frame-Options: DENY\r\n"
-> "\r\n"
reading 45 bytes...
-> "some url string"  <-- this is suspicous to me.
read 45 bytes
Conn close

The code I'm using to submit my data is:

private
def _http_client(method = 'get', location = nil, limit = 10) 
    raise ArgumentError, 'FATAL: too many HTTP redirects attempted...' if limit == 0
    response = nil 

    if location.nil?
        if @uri.nil?
            raise ArgumentError 'FATAL: no location specified. Quitting.'
        end 
    else
        @uri = URI.parse(location)
    end 

    client = Net::HTTP.new(@uri.host,@uri.port)
    client.open_timeout    = 15 # in seconds
    client.read_timeout    = 15 # in seconds
    initheader             = {'content-type' => 'application/json',
                              'accept'       => 'application/json',
                              'user-agent'   => UA                ,}
    client.set_debug_output $stderr  # XXX TEMPORARY

    if @uri.scheme == 'https'
        client.use_ssl = true
        client.verify_mode = 0 
    end 

    if method == 'post'
        serialized = JSON.generate(@payload)
        response   = client.send_request('POST',@uri.path,serialized,initheader = initheader)
        puts serialized
    end 

# Only intended for pings. In order to do
# full GETs (including query_params) this
# will need to be refactored a little.
    if method == 'get'
        response = client.get(@uri.path)
    end 

    case response
        when Net::HTTPSuccess
            @status = true
        when Net::HTTPMovedPermanently
            @status = false
            limit = limit - 1 
            _http_client(method,response['location'],limit)
        when Net::HTTPClientError
            $stderr.puts 'Client error.'
            @status = false
        when Net::HTTPServerError
            $stderr.puts 'Server error.'
            @status = false
        else
            $stderr.puts 'No idea what the server returned.'
            @status = false
    end 

    unless response.nil?
        @response  = {:code => response.code, :body => (response.body || 'OK')}
        @code      = @response[:code].to_s
        @http_body = @response[:body].to_s
    else
        $stderr.puts 'response from server was empty. :('
    end 

    _send_status
end

I'm using:

  • Ruby version: 1.9.3p448
  • NginX 1.2.6
  • Passenger 3.0.17

I'm pretty sure I might be doing something wrong, but I'm new to Ruby and semi-new to this kind of web programming.

The code snippet above uses the send_request method but I've also tried post, and post2, resulting in the same outcome.

It's really suspicious to me that as soon as I use 'application/json' in my initheader everything breaks. When I remove it, everything works alright.

¿Fue útil?

Solución

Try upgrading to Phusion Passenger 4. It handles I/O asynchrony better and in many cases avoids premature connection close problems.

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