B4J Question OKHttpClient Catch Exception

[achapman]

Hi all, just wondering if anyone knows how to catch java.net.ConnectException from the OkHttpClient?

To simulate this, all you have to do is try to send a request to a server that's simply not there.

I've tried wrapping the HttpClient.execute call in a try/catch, that doesn't help. Nothing is coming into the Main error handler or the HttpClient error reponse hander.

The exception in full is:

java.net.ConnectException: Failed to connect to /127.0.0.1:8080
at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:189)
at okhttp3.internal.connection.RealConnection.buildConnection(RealConnection.java:173)
at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:114)
at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:196)
at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:132)
at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:101)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:179)
at okhttp3.RealCall.execute(RealCall.java:63)
at anywheresoftware.b4h.okhttp.OkHttpClientWrapper.executeWithTimeout(OkHttpClientWrapper.java:156)
at anywheresoftware.b4h.okhttp.OkHttpClientWrapper.access$0(OkHttpClientWrapper.java:153)
at anywheresoftware.b4h.okhttp.OkHttpClientWrapper$ExecuteHelper.run(OkHttpClientWrapper.java:201)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at okhttp3.internal.platform.Platform.connectSocket(Platform.java:124)
at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:187)
... 26 more
Error occurred on line: 214 (API)
java.lang.NullPointerException
at anywheresoftware.b4h.okhttp.OkHttpClientWrapper$OkHttpResponse.getStatusCode(OkHttpClientWrapper.java:610)
at b4j.example.api._httpclient_responseerror(api.java:355)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:613)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:231)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:93)
at anywheresoftware.b4a.BA$3.run(BA.java:246)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:748)

Thanks in advance!
Andy.

 

[Erel]

Why aren't you using OkHttpUtils2?

 

[achapman]

I couldn't see how you can set custom HTTP headers using it? Say for example you need to make a POST or PUT request with a custom header, how would you do that with the HttpUtils2 lib?

 

[achapman]

It could be a great enhancement to OkHttpUtils2 to be able to add headers btw. Setting content type, encoding, and custom headers.

 

[Erel]

It is already possible.

https://www.b4x.com/android/forum/threads/set-http-request-header-with-httputils2.39413/#content

 

[achapman]

Oh nice, thank you!