Network or I/O error - HTTP 204 had non-zero Content-Length

[ghia]

Using DAVx5 with HORDE. Configuration was fine and used to work, but seems now stuck on following error (during sync in background?)

EXCEPTION:
java.net.ProtocolException: HTTP 204 had non-zero Content-Length: 20
	at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:135)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at at.bitfire.dav4jvm.BasicDigestAuthHandler.intercept(BasicDigestAuthHandler.kt:291)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at at.bitfire.davdroid.HttpClient$UserAgentInterceptor.intercept(HttpClient.kt:244)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.java:225)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
	at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:250)
	at okhttp3.RealCall.execute(RealCall.java:93)
	at at.bitfire.dav4jvm.DavResource$put$1.invoke(DavResource.kt:242)
	at at.bitfire.dav4jvm.DavResource$put$1.invoke(DavResource.kt:34)
	at at.bitfire.dav4jvm.DavResource.followRedirects(DavResource.kt:378)
	at at.bitfire.dav4jvm.DavResource.put(DavResource.kt:230)
	at at.bitfire.davdroid.syncadapter.SyncManager$uploadDirty$1$1.invoke(SyncManager.kt:326)
	at at.bitfire.davdroid.syncadapter.SyncManager$uploadDirty$1$1.invoke(SyncManager.kt:53)
	at at.bitfire.davdroid.syncadapter.SyncManager.useRemote(SyncManager.kt:809)
	at at.bitfire.davdroid.syncadapter.SyncManager$uploadDirty$1.invoke(SyncManager.kt:313)
	at at.bitfire.davdroid.syncadapter.SyncManager$uploadDirty$1.invoke(SyncManager.kt:53)
	at at.bitfire.davdroid.syncadapter.SyncManager.useLocal(SyncManager.kt:795)
	at at.bitfire.davdroid.syncadapter.SyncManager.uploadDirty(SyncManager.kt:304)
	at at.bitfire.davdroid.syncadapter.SyncManager$performSync$1.invoke(SyncManager.kt:126)
	at at.bitfire.davdroid.syncadapter.SyncManager$performSync$1.invoke(SyncManager.kt:53)
	at at.bitfire.davdroid.syncadapter.SyncManager.unwrapExceptions(SyncManager.kt:835)
	at at.bitfire.davdroid.syncadapter.SyncManager.performSync(SyncManager.kt:112)
	at at.bitfire.davdroid.syncadapter.CalendarsSyncAdapterService$CalendarsSyncAdapter.sync(CalendarsSyncAdapterService.kt:55)
	at at.bitfire.davdroid.syncadapter.SyncAdapterService$SyncAdapter.onPerformSync(SyncAdapterService.kt:73)
	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)

SOFTWARE INFORMATION
* at.bitfire.davdroid 2.4-ose (279)

Generated by SabreDAV 1.8.12-stable 2007-2015 http://sabre.io/

[rfc2822]

HTTP 204 No Content must not have a body and thus Content-Length (which is the definition of 204). It seems like your server has returned HTTP 204 with a body, which does not make sense and can’t be interpreted. Please fix your Web server/application server.