Exceptions in post filters can potentially result in a response with an incorrect content-length header.

[sverhagen]

Using Spring Cloud Finchley.SR2 (i.e. 2.0.2.RELEASE).

My application: simple Spring Boot application where Cloud Gateway forwards the request, then upon receiving the response does some additional processing using GatewayFilterSpec.modifyResponseBody. If an exception happens during this additional processing, the entire request should fail (the exception takes well care of that).

If running in an integration test, using RestAssured, the exception is thrown, but the request hangs. If the request is forcibly closed, sometimes I'm seeing the exception as shown at the end. I notice that the response in the exchange object has a Content-Length header set (matching the length of the response payload of the forwarded request).

If running the application, I'm not seeing this behavior.

If I delete the Content-Length header upon entry of the filter, everything seems to work, but this is an ugly solution (and scary to me, since I don't oversee the consequences).

Here is an example project. The README.md should be helpful to run it.

Thank you for looking into this.

---

io.restassured.internal.http.ResponseParseException: Internal Server Error

    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
    at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:83)
    at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:59)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:238)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:258)
    at io.restassured.internal.RequestSpecificationImpl$RestAssuredHttpBuilder.doRequest(RequestSpecificationImpl.groovy:2149)
    at io.restassured.internal.http.HTTPBuilder.doRequest(HTTPBuilder.java:494)
    at io.restassured.internal.http.HTTPBuilder.request(HTTPBuilder.java:451)
    at io.restassured.internal.http.HTTPBuilder$request$2.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:144)
    at io.restassured.internal.RequestSpecificationImpl.sendHttpRequest(RequestSpecificationImpl.groovy:1531)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:822)
    at io.restassured.internal.RequestSpecificationImpl.invokeMethod(RequestSpecificationImpl.groovy)
    at org.codehaus.groovy.runtime.callsite.PogoInterceptableSite.call(PogoInterceptableSite.java:47)
    at org.codehaus.groovy.runtime.callsite.PogoInterceptableSite.callCurrent(PogoInterceptableSite.java:57)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:51)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:157)
    at io.restassured.internal.RequestSpecificationImpl.sendRequest(RequestSpecificationImpl.groovy:1290)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:822)
    at io.restassured.internal.RequestSpecificationImpl.invokeMethod(RequestSpecificationImpl.groovy)
    at org.codehaus.groovy.runtime.callsite.PogoInterceptableSite.call(PogoInterceptableSite.java:47)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:152)
    at io.restassured.internal.filter.SendRequestFilter.filter(SendRequestFilter.groovy:30)
    at io.restassured.filter.Filter$filter$0.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at io.restassured.filter.Filter$filter.call(Unknown Source)
    at io.restassured.internal.filter.FilterContextImpl.next(FilterContextImpl.groovy:72)
    at io.restassured.filter.time.TimingFilter.filter(TimingFilter.java:56)
    at io.restassured.filter.Filter$filter.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at io.restassured.filter.Filter$filter.call(Unknown Source)
    at io.restassured.internal.filter.FilterContextImpl.next(FilterContextImpl.groovy:72)
    at io.restassured.filter.log.StatusCodeBasedLoggingFilter.filter(StatusCodeBasedLoggingFilter.java:93)
    at io.restassured.filter.log.ResponseLoggingFilter.filter(ResponseLoggingFilter.java:31)
    at io.restassured.filter.Filter$filter.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at io.restassured.filter.Filter$filter.call(Unknown Source)
    at io.restassured.internal.filter.FilterContextImpl.next(FilterContextImpl.groovy:72)
    at io.restassured.filter.log.RequestLoggingFilter.filter(RequestLoggingFilter.java:124)
    at io.restassured.filter.Filter$filter.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:144)
    at io.restassured.internal.filter.FilterContextImpl.next(FilterContextImpl.groovy:72)
    at io.restassured.filter.FilterContext$next.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:136)
    at io.restassured.internal.RequestSpecificationImpl.applyPathParamsAndSendRequest(RequestSpecificationImpl.groovy:1731)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:822)
    at io.restassured.internal.RequestSpecificationImpl.invokeMethod(RequestSpecificationImpl.groovy)
    at org.codehaus.groovy.runtime.callsite.PogoInterceptableSite.call(PogoInterceptableSite.java:47)
    at org.codehaus.groovy.runtime.callsite.PogoInterceptableSite.callCurrent(PogoInterceptableSite.java:57)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:51)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:157)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:185)
    at io.restassured.internal.RequestSpecificationImpl.applyPathParamsAndSendRequest(RequestSpecificationImpl.groovy:1737)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:822)
    at io.restassured.internal.RequestSpecificationImpl.invokeMethod(RequestSpecificationImpl.groovy)
    at org.codehaus.groovy.runtime.callsite.PogoInterceptableSite.call(PogoInterceptableSite.java:47)
    at org.codehaus.groovy.runtime.callsite.PogoInterceptableSite.callCurrent(PogoInterceptableSite.java:57)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:51)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:157)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:185)
    at io.restassured.internal.RequestSpecificationImpl.get(RequestSpecificationImpl.groovy:170)
    at io.restassured.internal.RequestSpecificationImpl.get(RequestSpecificationImpl.groovy)
    at net.sanderverhagen.ModifyResponseBodyIntegrationTest.testIncludedGetsException(ModifyResponseBodyIntegrationTest.java:87)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    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.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
    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$2.evaluate(ParentRunner.java:268)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 1584; received: 132
    at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:178)
    at org.apache.http.conn.EofSensorInputStream.read(EofSensorInputStream.java:135)
    at org.apache.http.conn.EofSensorInputStream$read.call(Unknown Source)
    at io.restassured.internal.RestAssuredResponseOptionsGroovyImpl.convertToByteArray(RestAssuredResponseOptionsGroovyImpl.groovy:429)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:51)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:157)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:169)
    at io.restassured.internal.RestAssuredResponseOptionsGroovyImpl.parseContent(RestAssuredResponseOptionsGroovyImpl.groovy:131)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:210)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:51)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:157)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:169)
    at io.restassured.internal.RestAssuredResponseOptionsGroovyImpl.parseResponse(RestAssuredResponseOptionsGroovyImpl.groovy:89)
    at io.restassured.internal.RestAssuredResponseOptionsGroovyImpl$parseResponse.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:152)
    at io.restassured.internal.RestAssuredResponseImpl.parseResponse(RestAssuredResponseImpl.groovy:24)
    at io.restassured.internal.RestAssuredResponseImpl$parseResponse.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:152)
    at io.restassured.internal.ResponseSpecificationImpl$HamcrestAssertionClosure$_getClosure_closure1.doCall(ResponseSpecificationImpl.groovy:452)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:264)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:41)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:136)
    at io.restassured.internal.RequestSpecificationImpl$RestAssuredHttpBuilder.doRequest(RequestSpecificationImpl.groovy:2146)
    ... 129 more

[ryanjbaxter]

What gets returned to the client when running the application?

[sverhagen]

In normal cases, the application would return the response payload of the forwarded request (but slightly modified, we're in a modifyResponseBody filter after all), something like this:

public Publisher<JsonNode> modifyBody(ServerWebExchange exchange, JsonNode jsonNode) {
   // make some modifications, we're in a "modifyResponseBody" filter after all
   ((ObjectNode) jsonNode).set("someNewKey", someNewStuff());

//    throw new RuntimeException("something wrong"); // imagine this exception thrown from someNewStuff()

    return Mono.just(jsonNode);
}

[sverhagen]

Just to reiterate, this example project should show the hanging behavior, "out of the box".

[ryanjbaxter]

I am not really sure what the gateway should do about this. Should we return a 500? What should be in the body?

@spencergibb thoughts?

[sverhagen]

It's not about what it returns. It's just that in certain circumstances, it does not return but just hangs. The example project shows this behavior.

[spencergibb]

It shouldn't hang, it should return a 500.

Caused by: org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 1584; received: 132

[spencergibb]

So, the gateway behaves properly and returns a 500.

The gateway doesn't hang, the rest assured client hangs.

2018-11-14 16:56:07.382 DEBUG 13197 --- [server-epoll-10] r.i.n.channel.ChannelOperationsHandler   : [id: 0x76ad2af7, L:/127.0.0.1:37323 - R:/127.0.0.1:43044] Writing object DefaultHttpResponse(decodeResult: success, version: HTTP/1.1)
HTTP/1.1 500 Internal Server Error
Content-Type: application/json;charset=UTF-8
Date: Wed, 14 Nov 2018 21:56:07 GMT
Content-Length: 1350
2018-11-14 16:56:07.384 DEBUG 13197 --- [server-epoll-10] r.ipc.netty.http.server.HttpServer       : [id: 0x76ad2af7, L:/127.0.0.1:37323 - R:/127.0.0.1:43044] WRITE: 143B
         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 48 54 54 50 2f 31 2e 31 20 35 30 30 20 49 6e 74 |HTTP/1.1 500 Int|
|00000010| 65 72 6e 61 6c 20 53 65 72 76 65 72 20 45 72 72 |ernal Server Err|
|00000020| 6f 72 0d 0a 43 6f 6e 74 65 6e 74 2d 54 79 70 65 |or..Content-Type|
|00000030| 3a 20 61 70 70 6c 69 63 61 74 69 6f 6e 2f 6a 73 |: application/js|
|00000040| 6f 6e 3b 63 68 61 72 73 65 74 3d 55 54 46 2d 38 |on;charset=UTF-8|
|00000050| 0d 0a 44 61 74 65 3a 20 57 65 64 2c 20 31 34 20 |..Date: Wed, 14 |
|00000060| 4e 6f 76 20 32 30 31 38 20 32 31 3a 35 36 3a 30 |Nov 2018 21:56:0|
|00000070| 37 20 47 4d 54 0d 0a 43 6f 6e 74 65 6e 74 2d 4c |7 GMT..Content-L|
|00000080| 65 6e 67 74 68 3a 20 31 33 35 30 0d 0a 0d 0a    |ength: 1350.... |
+--------+-------------------------------------------------+----------------+
2018-11-14 16:56:07.385 DEBUG 13197 --- [server-epoll-10] r.ipc.netty.http.server.HttpServer       : [id: 0x76ad2af7, L:/127.0.0.1:37323 - R:/127.0.0.1:43044] FLUSH
2018-11-14 16:56:07.385 DEBUG 13197 --- [server-epoll-10] r.i.n.channel.ChannelOperationsHandler   : [id: 0x76ad2af7, L:/127.0.0.1:37323 - R:/127.0.0.1:43044] Writing object 
2018-11-14 16:56:07.386 DEBUG 13197 --- [server-epoll-10] r.ipc.netty.http.server.HttpServer       : [id: 0x76ad2af7, L:/127.0.0.1:37323 - R:/127.0.0.1:43044] WRITE: 142B
         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 7b 22 74 69 6d 65 73 74 61 6d 70 22 3a 22 32 30 |{"timestamp":"20|
|00000010| 31 38 2d 31 31 2d 31 34 54 32 31 3a 35 36 3a 30 |18-11-14T21:56:0|
|00000020| 37 2e 33 33 37 2b 30 30 30 30 22 2c 22 70 61 74 |7.337+0000","pat|
|00000030| 68 22 3a 22 2f 61 70 69 31 2f 62 6c 61 68 2f 62 |h":"/api1/blah/b|
|00000040| 6c 61 68 22 2c 22 73 74 61 74 75 73 22 3a 35 30 |lah","status":50|
|00000050| 30 2c 22 65 72 72 6f 72 22 3a 22 49 6e 74 65 72 |0,"error":"Inter|
|00000060| 6e 61 6c 20 53 65 72 76 65 72 20 45 72 72 6f 72 |nal Server Error|
|00000070| 22 2c 22 6d 65 73 73 61 67 65 22 3a 22 73 6f 6d |","message":"som|
|00000080| 65 74 68 69 6e 67 20 77 72 6f 6e 67 22 7d       |ething wrong"}  |
+--------+-------------------------------------------------+----------------+

[spencergibb]

The only question remains is if gateway should do something with the content-length header or not on a local exception. I'm not sure about that. This would be a problem in general for all "post" filters that have a content-length header.