Does BPEL PM use Oracle HTTP Server

Hi,
Can anyone throw light on how BPEL PM invokes external partner links ? Does it use the Oracle HTTP server to send out the invoke request ?
TIA

Maybe use should define what you mean by an internal service as you can connect to DB, JMS, AQ, WS, etc. I'm assuming you mean web service therefore basically the mechanism is HTTP. This does not mean that you need OHS. Also internal services can go through a HTTP server if you desire.
SOA Suite uses the same technology for both internal and external services. It is only your network that restricts connectivity. SOA Suite can connect directly to external services but this generally isn't recommended as it is a security risk.
If OHS is killed then you should fail over to another OHS, if this configuration is not in place you will lose connectivity to external services.
Have a look at this doc, it shows a Oracle's recommendation for enterprise deployments.
http://download.oracle.com/docs/cd/E12839_01/core.1111/e12036/toc.htm
cheers
James

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