Question

我升级了现有的应用程序，在新版本中我需要OS 5 - 其中一个原因是我想使用 ConnectionFactory 通过HTTP / HTTPS进行通信我们的服务器无需添加所有URL参数即可使用BES，BIS，Direct TCP，Wifi等。

ConnectionFactory 现在已配置为选择通过首选类型连接到我们服务的最佳方式。

我的连接代码如下所示：

ConnectionFactory connectionFactory = new ConnectionFactory();
BisBOptions bisOptions = new BisBOptions(BIS_SECRET);
connectionFactory.setTransportTypeOptions(TransportInfo.TRANSPORT_BIS_B, bisOptions);
connectionFactory.setConnectionMode(ConnectionFactory.ACCESS_READ_WRITE);
connectionFactory.setEndToEndDesired(true);
connectionFactory.setPreferredTransportTypes(new int[] { TransportInfo.TRANSPORT_BIS_B, TransportInfo.TRANSPORT_MDS,
TransportInfo.TRANSPORT_TCP_WIFI, TransportInfo.TRANSPORT_TCP_CELLULAR });
ConnectionDescriptor connectionDescriptor = connectionFactory.getConnection("https://myserver.com/serviceurl");
try {
  HttpConnection con = (HttpConnection) connectionDescriptor.getConnection();
  byte[] bytes = parameter.toString().getBytes(UTF_8);
  con.setRequestProperty(CONTENT_LENGTH, String.valueOf(bytes.length));
  os = con.openOutputStream();
  os.write(bytes);
  os.flush();
  int responseCode = con.getResponseCode();
  if (responseCode == 401) {
    throw new InvalidCredentialsException("Invalid credentials");
  } else if (responseCode != 200 && responseCode != 500) {
    EventLogger.logEvent(RTSID, ("Response code " + responseCode + " " + con
          .getResponseMessage()).getBytes(), EventLogger.ERROR);
    EventLogger.logEvent(RTSID, bytes, EventLogger.ERROR);
    throw new IOException("Invalid request");
  }
  is = con.openInputStream();
  if (is != null) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    int c = 0;
    try {
      c = is.read();
    } catch (Exception ex) {
      c = -1;
    }
    while (c >= 0) {
      baos.write(c);
      try {
        c = is.read();
      } catch (Exception ex) {
        c = -1;
      }
    }
    String response = new String(baos.toByteArray(), UTF_8);
    try {
      JSONObject jsonObject;
      if (response.startsWith("[")) {
        jsonObject = new JSONObject();
        jsonObject.put(ARRAY, new JSONArray(response));
      } else {
        jsonObject = new JSONObject(response);
      }
      if (responseCode == 500) {
        throw new Exception(jsonObject.getString("message"));
      }
      return jsonObject;
    } catch (JSONException e) {
      EventLogger.logEvent(RTSID, ("Exception occured: " + e.toString()).getBytes(),
      EventLogger.ERROR);
    }
  }
} finally {
  if (is != null) {
    try {
      is.close();
    } catch (Exception e) {
    }
  }
  if (os != null) {
    try {
      os.close();
    } catch (Exception e) {
    }
  }
  if (con != null) {
    try {
      con.close();
    } catch (Exception e) {
    }
  }
}

我的问题是，这种方式不如我手动将连接参数添加到我的URL时那样好。我在服务器日志中遇到错误，看起来客户端在某种超时后关闭连接。

以下是一些日志示例：

93.186.30.120 - - [28/Jun/2012:15:50:08 +0200] "POST /service/methodX HTTP/1.1" 400 145 "-" "myapp VendorID/301" 10012567 
93.186.22.118 - - [28/Jun/2012:16:30:56 +0200] "POST /service/methodY HTTP/1.1" 400 145 "-" "myapp VendorID/137" 10012435
74.82.68.35 - - [28/Jun/2012:16:53:23 +0200] "POST /service/methodZ HTTP/1.1" 400 145 "-" "myapp BlackBerry9650/6.0.0.524 VendorID/105" 10012644

IP地址来自 RIM Networks - 所以这些是来自 BIS 的连接

这些连接从服务器获得状态码 400（错误请求）

该行末尾的大数字（例如10012644）显示服务器上处理请求的时间（以微秒为单位）：10012644 =约10秒

RIM服务器是否添加 10秒的连接超时？这似乎相当短暂！

问题难以复制 - 有没有人经历过类似的事情？

Answer 1

我找到了原因。问题是由Apache模块mod_reqtimeout的默认配置引起的：

<IfModule reqtimeout_module>

# mod_reqtimeout limits the time waiting on the client to prevent an
# attacker from causing a denial of service by opening many connections
# but not sending requests. This file tries to give a sensible default
# configuration, but it may be necessary to tune the timeout values to
# the actual situation. Note that it is also possible to configure
# mod_reqtimeout per virtual host.


# Wait max 20 seconds for the first byte of the request line+headers
# From then, require a minimum data rate of 500 bytes/s, but don't
# wait longer than 40 seconds in total.
# Note: Lower timeouts may make sense on non-ssl virtual hosts but can
# cause problem with ssl enabled virtual hosts: This timeout includes
# the time a browser may need to fetch the CRL for the certificate. If
# the CRL server is not reachable, it may take more than 10 seconds
# until the browser gives up.
RequestReadTimeout header=20-40,minrate=500

# Wait max 10 seconds for the first byte of the request body (if any)
# From then, require a minimum data rate of 500 bytes/s
RequestReadTimeout body=10,minrate=500

</IfModule>

我认为BlackBerry客户端受到的打击更为严重，因为通过RIM BIS基础架构发送请求主体需要更长的时间。

将值设置为100秒并监控客户端是否仍受影响。

BlackBerry ConnectionFactory超时

1 个答案: