Stop sending app.content to Meta

[zwl-williamzha]

What

Drop app.content from the bid request the audienceNetwork adapter sends to Meta.

MSP's document module fills app.content.url with the canonical article URL (www.newsbreak.com/n/{doc_id}, or the app's base URL on non-article slots) so bidders get a contextual signal. Meta should not receive it.

	if out.App != nil {
		app := *out.App
		app.Publisher = &openrtb2.Publisher{ID: pubId}
		// Meta does not get the article URL MSP puts on app.content.
		app.Content = nil
		out.App = &app
	}

Why here

modifyRequest already shallow-copies App per outgoing request in order to overwrite Publisher, which makes it the one safe place to edit it. The auction's App pointer is shared across bidder goroutines — ortb.CloneBidRequestPartial deep-copies only Device, User and Source — so stripping it anywhere upstream (an MSP wrapper adapter or a bidder-request hook) would also strip it from Google/Nova/Moloco and race with them. Nil'ing the copy leaves every other seat untouched.

It also covers both Meta paths in MSP in one place: the plain audienceNetwork seat (9 stored imps) and the msp_fb_* aliases (341), which build from this same Builder via pkg/adapters/fb/core.go.

app.content is MSP-generated and holds only the URL, so nil'ing the object drops nothing else in practice.

Test

New exemplary fixture banner-app-content.json: mock request carries app.content.url and app.domain, expected outgoing body keeps domain and drops content — so it pins "only content goes, the rest of app stays." TestJsonSamples picks it up from the directory automatically.

go test ./adapters/audienceNetwork/... passes; with the two lines reverted the new fixture fails on the "content" diff.

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