Local cache module: use createObjectUrl for rendering cache

[patmmccann]

Type of issue

feature

Description

Related #11353

The goal is to replace the use of prebid cache with a local cache with configuration. This could be a module to provide the alternate caching mechanism with a goal of improved performance and decreased network activity.

Player compatability may be unknown at time of release and publishers would be encouraged to use in an experimental fashion.

[karimMourra]

Does the local cache work with GAM auctions ? For example, if the winning bid then has to compete in a GAM auction via Google IMA SDK, does this work ?

[dgirardi]

Does the local cache work with GAM auctions ? For example, if the winning bid then has to compete in a GAM auction via Google IMA SDK, does this work ?

No. There are two issues:

• GAM will not accept anything but https at the beginning of VAST URLs, it cannot be a macro that resolves to a blob URL. We can work around this by using a dummy URL and intercepting it client side with service workers, but setting that up takes more effort than it's ideal.
• IMA runs in a cross-origin frame and thus cannot fetch blobs created in the first party's origin. I don't think we can work around this - the SDK needs to support it, with some way to pass it the contents of the VAST / blob.

[karimMourra]

@patmmccann if GAM can't support this then is there any value to implementing ?