Host Header is ignored in HTTP Request implementation

[Bhadauria, Tarun Kumar]

JMeter version 2.13

I added host header in HTTP Header Manager with HTTP Request Implementation
- HTTP Client 4 but found it missing on request in view Results Tree
listener. (Which results in test failure) -

http://www.awesomescreenshot.com/image/1065695/49c6d60c132a1e479e9907d83270b405

When I change the HTTP Request Implementation to Java then Host entry is
set -

http://www.awesomescreenshot.com/image/1065707/d6cc8de1f6be8e409f5f330efcbe5662

Is it a known issue?

Thanks
Tarun K