AndroidにHTTPサーバーがあります。上記のリンクのように、HTTPリクエストごとに新しいスレッドを作成します。
複数のGETリクエストを発行すると、次のような例外が発生することがあります。
01-22 10:28:22.779: W/System.err(2019): java.net.SocketException: recvfrom failed: ECONNRESET (Connection reset by peer)
01-22 10:28:22.779: W/System.err(2019): at libcore.io.IoBridge.maybeThrowAfterRecvfrom(IoBridge.java:552)
01-22 10:28:22.779: W/System.err(2019): at libcore.io.IoBridge.recvfrom(IoBridge.java:516)
01-22 10:28:22.779: W/System.err(2019): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
01-22 10:28:22.779: W/System.err(2019): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
01-22 10:28:22.784: W/System.err(2019): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
01-22 10:28:22.784: W/System.err(2019): at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103)
01-22 10:28:22.784: W/System.err(2019): at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:191)
01-22 10:28:22.784: W/System.err(2019): at org.apache.http.impl.io.HttpRequestParser.parseHead(HttpRequestParser.java:71)
01-22 10:28:22.784: W/System.err(2019): at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:174)
01-22 10:28:22.784: W/System.err(2019): at org.apache.http.impl.AbstractHttpServerConnection.receiveRequestHeader(AbstractHttpServerConnection.java:141)
01-22 10:28:22.784: W/System.err(2019): at org.apache.http.protocol.HttpService.handleRequest(HttpService.java:135)
01-22 10:28:22.784: W/System.err(2019): at com.example.devicecommunication.ConnectService$WorkerThread.run(ConnectService.java:744)
01-22 10:28:22.784: W/System.err(2019): Caused by: libcore.io.ErrnoException: recvfrom failed: ECONNRESET (Connection reset by peer)
01-22 10:28:22.784: W/System.err(2019): at libcore.io.Posix.recvfromBytes(Native Method)
01-22 10:28:22.784: W/System.err(2019): at libcore.io.Posix.recvfrom(Posix.java:131)
01-22 10:28:22.784: W/System.err(2019): at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:164)
01-22 10:28:22.789: W/System.err(2019): at libcore.io.IoBridge.recvfrom(IoBridge.java:513)
01-22 10:28:22.789: W/System.err(2019): ... 10 more
なぜこれが発生するのかわかりません。以下は使用されるコードであり、この例外はhandleRequest()メソッドまたはconn.close()で発生します。
class WorkerThread extends Thread{
HttpService httpService;
HttpServerConnection conn;
public WorkerThread(HttpService httpService, HttpServerConnection conn){
super();
this.httpService = httpService;
this.conn = conn;
}
public void run(){
HttpContext context = new BasicHttpContext(null);
try {
Log.d(TAG,"Going to call Handle request here");
this.httpService.handleRequest(this.conn, context);
} catch (ConnectionClosedException ex) {
ex.printStackTrace();
Log.d(TAG,"Client closed connection exception");
} catch (IOException ex) {
ex.printStackTrace();
Log.d(TAG,"I/O exceptionnnnn " + ex.getMessage());
} catch (HttpException ex) {
Log.d(TAG,"Unrecoverable HTTP protocol violation: " + ex.getMessage());
}
finally {
Log.d(TAG,"Inside Finally Block");
try {
this.conn.close();
Log.d(TAG,"Connection closed successfully");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
なぜこれが発生するのか、またはどのように解決できるのか、何か考えはありますか?