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AWS Classic ELB instantly returning 504 to the client(apache commons or native java client only) without the backend receiving the request

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1

I am encountering a strange behavior where AWS Classic ELB is sending an indeterministic 504 response to the client instantly. The backend server (running on a K8S cluster) never receives a request. The ELB timeout can be ignored for consideration. The client gets the response within few milliseconds.

This behavior is seen when using Apache Commons HTTP Client or Java's native HttpConnection. If I use the Unirest Java library, this no longer happens. Also, when Python's native requests library is used, it does not experience this problem.

Does anyone have some idea why this could be happening specifically when using different HTTP clients? HTTP 5XX is supposed to be server-side issue. I tried increasing client side connection and socket timeouts, but there is no effect at all. I'm using same headers across all the requests.

java amazon-web-services kubernetes amazon-elb

share|improve this question

edited Mar 22 at 16:29

Kevin Evans

3,01033761

asked Mar 22 at 16:22

SulavSulav

61

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have you traced the HTTP conversation? Something must be different between the two.
  
  – stdunbar
  Mar 22 at 16:40
  

  
  
  
  

add a comment | 

1

I am encountering a strange behavior where AWS Classic ELB is sending an indeterministic 504 response to the client instantly. The backend server (running on a K8S cluster) never receives a request. The ELB timeout can be ignored for consideration. The client gets the response within few milliseconds.

This behavior is seen when using Apache Commons HTTP Client or Java's native HttpConnection. If I use the Unirest Java library, this no longer happens. Also, when Python's native requests library is used, it does not experience this problem.

Does anyone have some idea why this could be happening specifically when using different HTTP clients? HTTP 5XX is supposed to be server-side issue. I tried increasing client side connection and socket timeouts, but there is no effect at all. I'm using same headers across all the requests.

java amazon-web-services kubernetes amazon-elb

share|improve this question

edited Mar 22 at 16:29

Kevin Evans

3,01033761

asked Mar 22 at 16:22

SulavSulav

61

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have you traced the HTTP conversation? Something must be different between the two.
  
  – stdunbar
  Mar 22 at 16:40
  

  
  
  
  

add a comment | 

I am encountering a strange behavior where AWS Classic ELB is sending an indeterministic 504 response to the client instantly. The backend server (running on a K8S cluster) never receives a request. The ELB timeout can be ignored for consideration. The client gets the response within few milliseconds.

This behavior is seen when using Apache Commons HTTP Client or Java's native HttpConnection. If I use the Unirest Java library, this no longer happens. Also, when Python's native requests library is used, it does not experience this problem.

Does anyone have some idea why this could be happening specifically when using different HTTP clients? HTTP 5XX is supposed to be server-side issue. I tried increasing client side connection and socket timeouts, but there is no effect at all. I'm using same headers across all the requests.

java amazon-web-services kubernetes amazon-elb

share|improve this question

edited Mar 22 at 16:29

Kevin Evans

3,01033761

asked Mar 22 at 16:22

SulavSulav

61

java amazon-web-services kubernetes amazon-elb

java amazon-web-services kubernetes amazon-elb

share|improve this question

edited Mar 22 at 16:29

Kevin Evans

3,01033761

asked Mar 22 at 16:22

SulavSulav

61

share|improve this question

edited Mar 22 at 16:29

Kevin Evans

3,01033761

asked Mar 22 at 16:22

SulavSulav

61

edited Mar 22 at 16:29

Kevin Evans

3,01033761

edited Mar 22 at 16:29

Kevin Evans

3,01033761

asked Mar 22 at 16:22

SulavSulav

61

asked Mar 22 at 16:22

SulavSulav

61