Intermediate proxies (The Polipo Manual)

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#### 3.3.3 Adjusting intermediate proxy behaviour

Implementors of intermediate caches (proxies) have found it useful to convert the media type of certain entity bodies. A non-transparent proxy might, for example, convert between image formats in order to save cache space or to reduce the amount of traffic on a slow link.

If `alwaysAddNoTransform` is true (it is false by default), Polipo will add a ’no-transform’ cache control directive to all outgoing requests. This directive forbids (compliant) intermediate caches from responding with an object that was compressed or transformed in any way.