SocketTimeoutException in MockWebServer while using custom authenticator and mocking 401 Unauthorized response

[anidotnet]

Below test throws SocketTimeoutException without any proper reason.

    @Test
    public void test() throws IOException {
        OkHttpClient client = new OkHttpClient.Builder()
                .connectTimeout(100, TimeUnit.MILLISECONDS)
                .readTimeout(100, TimeUnit.MILLISECONDS)
                .authenticator(new Authenticator() {
                    public Request authenticate(Route route, Response response) throws IOException {
                        String credential = Credentials.basic("test", "test");
                        return response.request().newBuilder().header("Authorization", credential).build();
                    }
                })
                .build();
        MockWebServer webServer = new MockWebServer();

        Request request = new Request.Builder()
                .url(webServer.url("/"))
                .build();

        webServer.enqueue(new MockResponse()
                .setBody("{}")
                .setResponseCode(401));
        String response = client.newCall(request).execute().body().string();
        assertEquals(response, "{}");
    }

But the test passes if I set the response code in MockResponse to 200 as below

webServer.enqueue(new MockResponse()
                .setBody("{}")
                .setResponseCode(200));

Again the above test never completes if I don't put timeout settings for OkHttpClient as below

OkHttpClient client = new OkHttpClient.Builder()
//                .connectTimeout(100, TimeUnit.MILLISECONDS)
//                .readTimeout(100, TimeUnit.MILLISECONDS)
                .authenticator(new Authenticator() {
                    public Request authenticate(Route route, Response response) throws IOException {
                        String credential = Credentials.basic("test", "test");
                        return response.request().newBuilder().header("Authorization", credential).build();
                    }
                })
                .build();

The test keep waiting at the line client.newCall(request).execute().body().string();

Here is the stacktrace and log for the SocketTimeoutException

Mar 08, 2017 12:15:03 PM okhttp3.mockwebserver.MockWebServer$2 execute
INFO: MockWebServer[46822] starting to accept connections
Mar 08, 2017 12:15:03 PM okhttp3.mockwebserver.MockWebServer$2 execute
INFO: MockWebServer[48936] starting to accept connections
Mar 08, 2017 12:15:03 PM okhttp3.mockwebserver.MockWebServer$3 processOneRequest
INFO: MockWebServer[48936] received request: GET / HTTP/1.1 and responded: HTTP/1.1 401 Client Error
Mar 08, 2017 12:15:03 PM okhttp3.mockwebserver.MockWebServer$2 acceptConnections
INFO: MockWebServer[46822] done accepting connections: Socket closed

java.net.SocketTimeoutException: timeout

	at okio.Okio$4.newTimeoutException(Okio.java:227)
	at okio.AsyncTimeout.exit(AsyncTimeout.java:284)
	at okio.AsyncTimeout$2.read(AsyncTimeout.java:240)
	at okio.RealBufferedSource.indexOf(RealBufferedSource.java:325)
	at okio.RealBufferedSource.indexOf(RealBufferedSource.java:314)
	at okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:210)
	at okhttp3.internal.http1.Http1Codec.readResponseHeaders(Http1Codec.java:189)
	at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:67)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
	at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
	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 org.dizitart.no2.sync.WormholeUserTemplateTest.test(WormholeUserTemplateTest.java:140)
	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 org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
	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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.net.SocketTimeoutException: Read timed out
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
	at java.net.SocketInputStream.read(SocketInputStream.java:170)
	at java.net.SocketInputStream.read(SocketInputStream.java:141)
	at okio.Okio$2.read(Okio.java:138)
	at okio.AsyncTimeout$2.read(AsyncTimeout.java:236)
	... 49 more

[swankjesse]

When you install an Authenticator, OkHttp will retry requests that failed with a 401 Unauthorized response. But your MockWebServer only has a single response to return, so nothing completes. This is working as designed.

[anidotnet]

@swankjesse so how do I make OkHttp not to retry after a 401 response?

[swankjesse]

Remove your Authenticator or change it to return null.