Java simple code java net SocketException Unexpected end of file from server

Question

I wrote some simple code in Java  the method should connect to the website and return the BufferedReader   private BufferedReader getConnection String url a            URL url          try               System out println  getting connection                url   new URL url a               HttpURLConnection urlConnection    HttpURLConnection                        url openConnection                urlConnection addRequestProperty  User-Agent                        Mozilla 5 0  X11  U  Linux i586  en-US  rv 1 7 3  Gecko 20040924                          Epiphany 1 4 4  Ubuntu                 inStream   new InputStreamReader urlConnection getInputStream                 return new BufferedReader inStream             catch  Exception ex                Logger getLogger Reader class getName    log Level SEVERE  null  ex                     return null       When I use it on my PC  it works fine but when I put  jar file on the server I get this error   java net SocketException  Unexpected end of file from server at sun net www http HttpClient parseHTTPHeader HttpClient java 718  at sun net www http HttpClient parseHTTP HttpClient java 579  at sun net www http HttpClient parseHTTPHeader HttpClient java 715  at sun net www http HttpClient parseHTTP HttpClient java 579  at sun net www protocol http HttpURLConnection getInputStream HttpURLConnection java 1322  at dataconverter Reader getConnection Reader java 260    Problem is quite strange because the exception isn t thrown each time  sometimes everything is OK and program works fine   Has anybody got any ideas

User · Answer

Summary

This exception is encountered when you are expecting a response, but the socket has been abruptly closed.

Detailed Explanation

Java's HTTPClient, found here, throws a SocketException with message "Unexpected end of file from server" in a very specific circumstance.

After making a request, HTTPClient gets an InputStream tied to the socket associated with the request. It then polls that InputStream repeatedly until it either:

Finds the string "HTTP/1."
The end of the InputStream is reached before 8 characters are read
Finds a string other than "HTTP/1."

In case of number 2, HTTPClient will throw this SocketException if any of the following are true:

The HTTP method is CONNECT
The HTTP method is POST and the client is set to streaming mode

Why would this happen

This indicates that the TCP socket has been closed before the server was able to send a response. This could happen for any number of reasons, but some possibilities are:

Network connection was lost
The server decided to close the connection
Something in between the client and the server (nginx, router, etc) terminated the request

_{Note: When Nginx reloads its config, it forcefully closes any in-flight HTTP Keep-Alive connections (even POSTs), causing this exact error.}

User · Answer

I do get this error when I do not set the Authentication header or I set wrong credentials

User · Answer

I would suggest using wire shark to trace packets  If you are using Ubuntu  sudo-apt get wireshark  Like Joni stated the only way to figure out whats going wrong is to follow the GET requests and their associated responses    http   www wireshark org download html

User · Answer

Most likely the headers you are setting is incorrect or not acceptable   Example  connnection setRequestProperty  content-type    application json

User · Answer

In my case it was solved just passing proxy to connection  Thanks to  Andreas Panagiotidis   Proxy proxy   new Proxy Proxy Type HTTP  new InetSocketAddress   lt YOUR HOST gt    80     HttpsURLConnection con    HttpsURLConnection  url openConnection proxy

User · Answer

Unexpected end of file  implies that the remote server accepted and closed the connection without sending a response  It s possible that the remote system is too busy to handle the request  or that there s a network bug that randomly drops connections   It s also possible there is a bug in the server  something in the request causes an internal error  and the server simply closes the connection instead of sending a HTTP error response like it should  Several people suggest this is caused by missing headers or invalid header values in the request   With the information available it s impossible to say what s going wrong  If you have access to the servers in question you can use packet sniffing tools to find what exactly is sent and received  and look at logs to of the server process to see if there are any error messages

User · Answer

In my case   url contained wrong chars like spaces   Overall log your url  and in some cases use browser

User · Answer

I got this exception too  MY error code is below          HttpURLConnection connection    HttpURLConnection  url openConnection        connection setRequestMethod requestMethod           connection setRequestProperty  Content-type    JSON      I found  Content-type  should not be  JSON  is wrong  I solved this exception by update this line to below          connection setRequestProperty  Content-type    application json      you can check up your  Content-type

[java] Java simple code: java.net.SocketException: Unexpected end of file from server

Summary

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