与android的socket.io进行通信
问题摘要
我正在尝试将一个简单的socket.io聊天应用程序捆绑到一个原生应用程序中，以使用phonegap在Android 2.2及更高版本上运行。
socket.io Web客户端 - > socket.io服务器工作
我有一个运行socket.io的简单服务器，它在一个web浏览器中运行时与一个socket.io客户端成功通信。
移动浏览器中的socket.io移动客户端 - > socket.io服务器工作
请注意，由于Android 2.2不支持websockets，因此它默认返回到xhr轮询，在通过Android 2.2上的Web浏览器连接时从服务器接收消息
[root@webnode-2 nodechat]# node server.js
info - socket.io started
debug - client authorized
info - handshake authorized 6036976111002307981
debug - setting request GET /socket.io/1/xhr-polling/6036976111002307981?t=1332184313758
debug - setting poll timeout
debug - client authorized for
debug - clearing poll timeout
debug - xhr-polling writing 1::
debug - set close timeout for client 6036976111002307981
6036976111002307981
debug - setting request GET /socket.io/1/xhr-polling/6036976111002307981?t=1332184313839
debug - setting poll timeout
debug - clearing poll timeout
debug - xhr-polling writing 5:::{"name":"message","args":["Welcome stranger!"]}
debug - set close timeout for client 6036976111002307981
debug - discarding transport
debug - cleared close timeout for client 6036976111002307981
debug - setting request GET /socket.io/1/xhr-polling/6036976111002307981?t=1332184313928
debug - setting poll timeout
debug - discarding transport
debug - cleared close timeout for client 6036976111002307981
debug - clearing poll timeout
debug - xhr-polling writing 8::
debug - set close timeout for client 6036976111002307981
debug - xhr-polling closed due to exceeded duration
debug - setting request GET /socket.io/1/xhr-polling/6036976111002307981?t=1332184334139
debug - setting poll timeout
debug - discarding transport
debug - cleared close timeout for client 6036976111002307981
debug - xhr-polling received data packet 5:::{"name":"connect_friends","args":[{"user_id":"2","friends_list":[1,2,3,4,5,6,7,8,9,10]}]}
REGISTER USER
{ user_id: '2',
friends_list: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] }
10
assigned user_id: 2 to socket 6036976111002307981
来自phonegap的socket.io - > socket.io服务器失败
但是，当我尝试在phonegap中连接socket.io时，连接已打开，但很快关闭。
在android日志中，它有一个关于需要flash player> v10的错误，但我的手机有flash player v 11.1
03-19 11:38:46.847: I/PhoneGapLog(18469): Found log level DEBUG 03-19 11:38:46.847: I/PhoneGapLog(18469): Changing log level to DEBUG(3) 03-19 11:38:46.847: D/DroidGap(18469): DroidGap.onCreate() 03-19 11:38:46.847: D/DroidGap(18469): DroidGap.loadUrl(file:///android_asset/www/index.html) 03-19 11:38:46.847: D/DroidGap(18469): DroidGap: url=file:///android_asset/www/index.html baseUrl=file:///android_asset/www/ 03-19 11:38:46.847: D/DroidGap(18469): DroidGap.init() 03-19 11:38:46.941: D/dalvikvm(18469): GC_FOR_MALLOC freed 6234 objects / 618952 bytes in 68ms 03-19 11:38:46.968: D/SoftKeyboardDetect(18469): Ignore this event 03-19 11:38:47.007: D/SoftKeyboardDetect(18469): Ignore this event 03-19 11:38:47.058: D/SoftKeyboardDetect(18469): Ignore this event03-19 11:38:47.241: D/PhoneGapLog(18469): Flash Player >= 10.0.0 is required. 03-19 11:38:47.241: D/PhoneGapLog(18469): file:///android_asset/www/js/socket.io/socket.io.js: Line 2622 : Flash Player >= 10.0.0 is required. 03-19 11:38:47.241: E/Web Console(18469): Flash Player >= 10.0.0 is required. at file:///android_asset/www/js/socket.io/socket.io.js:2622
03-19 11:38:47.796: D/PhoneGapLog(18469): Receiving Welcome stranger! 03-19 11:38:47.796: D/PhoneGapLog(18469): file:///android_asset/www/index.html: Line 8 : Receiving Welcome stranger! 03-19 11:38:47.796: I/Web Console(18469): Receiving Welcome stranger! at file:///android_asset/www/index.html:8 03-19 11:39:07.007: E/DroidGap(18469): DroidGap: TIMEOUT ERROR! - calling webViewClient 03-19 11:39:07.007: D/Cordova(18469): DroidGap: GapViewClient.onReceivedError: Error code=-6 Description=The connection to the server was unsuccessful. URL=file:///android_asset/www/index.html 03-19 11:39:07.167: D/SoftKeyboardDetect(18469): Ignore this event 03-19 11:39:16.323: D/dalvikvm(18469): GC_EXPLICIT freed 6130 objects / 505920 bytes in 156ms
服务器上的事件日志是
[root@webnode-2 nodechat]# node server.js
info - socket.io started
debug - client authorized
info - handshake authorized 1009349893764580916
debug - setting request GET /socket.io/1/xhr-polling/1009349893764580916?t=1332182327502
debug - setting poll timeout
debug - client authorized for
debug - clearing poll timeout
debug - xhr-polling writing 1::
debug - set close timeout for client 1009349893764580916
debug - setting request GET /socket.io/1/xhr-polling/1009349893764580916?t=1332182327602
debug - setting poll timeout
debug - clearing poll timeout
debug - xhr-polling writing 5:::{"name":"message","args":["Welcome stranger!"]}
debug - set close timeout for client 1009349893764580916
debug - discarding transport
debug - cleared close timeout for client 1009349893764580916
debug - setting request GET /socket.io/1/xhr-polling/1009349893764580916?t=1332182327802
debug - setting poll timeout
debug - discarding transport
debug - cleared close timeout for client 1009349893764580916
debug - clearing poll timeout
info - transport end
debug - set close timeout for client 1009349893764580916
debug - cleared close timeout for client 1009349893764580916
DISCONNECTED EVENT
debug - discarding transport
debug - client authorized
info - handshake authorized 2044675477593417130
debug - setting request GET /socket.io/1/xhr-polling/2044675477593417130?t=1332182347938
debug - setting poll timeout
debug - client authorized for
debug - clearing poll timeout
debug - xhr-polling writing 1::
debug - set close timeout for client 2044675477593417130
debug - setting request GET /socket.io/1/xhr-polling/2044675477593417130?t=1332182348112
debug - setting poll timeout
debug - clearing poll timeout
debug - xhr-polling writing 5:::{"name":"message","args":["Welcome stranger!"]}
debug - set close timeout for client 2044675477593417130
debug - discarding transport
debug - cleared close timeout for client 2044675477593417130
debug - setting request GET /socket.io/1/xhr-polling/2044675477593417130?t=1332182348308
debug - setting poll timeout
debug - discarding transport
debug - cleared close timeout for client 2044675477593417130
debug - clearing poll timeout
info - transport end
debug - set close timeout for client 2044675477593417130
debug - cleared close timeout for client 2044675477593417130
DISCONNECTED EVENT
debug - discarding transport
来自服务器的消息“欢迎陌生人！” 被电话接收。 在电话上显示应用程序错误对话框，与服务器的连接失败。 （文件：///android_asset/www/index.html）
手机间隙websockets客户端 - > socket.io服务器失败
然后我读到了phonegap中尚未支持的websockets，并且在Android的Phonegap应用程序中遇到了此项目以支持WebSocket。 当我得到这个运行并试图连接到socket.io服务器，我得到了错误
[root@webnode-2 nodechat]# node server.js info - socket.io started debug - destroying non-socket.io upgrade
我相信这是由于试图连接到使用websockets而不使用socket.io客户端js的socket.io服务器。 我用一个node.js服务器测试了它，它工作正常
问题
你将需要看看你的HTTP头。 我的猜测是，客户端不是发送保持活动状态，就是被服务器忽略。 在客户端发送的XHR请求中查找“Connection：keep-alive”。 另请看一下服务器端的响应。 另一个指标可能是发送的http版本.. 1.0将暗示连接将在请求后关闭。
1 - Socket.io在websocket上添加另一个图层（例如添加了心跳）。 连接到第三方库不会被服务器接受（'destroying nonsocket.io upgrade'消息表明这一点）。 我还没有找到/使用过解决方案，我可以修改phonegap ObjectiveC代码来加载外部URL而不是使用本地资源来避免此问题：Socket.io + PhoneGap。
2 - 轮询是客户端连接到服务器的一种技巧，就好像它想要加载页面一样。 但服务器不提供页面，它在到达时写入消息，模拟套接字连接。 但是，协议栈（浏览器端http，如果我理解所有？）不允许无限连接。 它会破坏连接，造成超时。 然后socket.io客户端将重新建立一个新的连接，直到它再次超时。 所以每30秒周期性的超时是一个正常的行为。 如果连接瞬间断开，这可能是一个访问原点问题，但我不确定。
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