HTTP supports stacking proxies for both request and response
entities (e.g.: data bodies). This is controlled by the
request_stack and response_stack attribute hashes. See also Section 2.3.1, Proxy stacking.
There are two stacking modes available: HTTP_STK_DATA sends only the data portion to the downstream proxy, while HTTP_STK_MIME also sends all header information to make it possible to process the data body as a MIME envelope. Please note that while it is possible to change the data part in the stacked proxy, it is not possible to change the MIME headers - they can be modified only by the HTTP proxy. The possible parameters are listed in the following tables.
| Action | Description |
|---|---|
| HTTP_STK_NONE | No additional proxy is stacked into the HTTP proxy. |
| HTTP_STK_DATA | The data part of the HTTP traffic is passed to the specified stacked proxy. |
| HTTP_STK_MIME | The data part including header information of the HTTP traffic is passed to the specified stacked proxy. |
Table 4.11. Constants for proxy stacking
Please note that stacking is skipped altogether if there is no body in the message.
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