Reinstate Playground XYZ adapter with v3 support

[monofonik]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Does this change affect user-facing APIs or examples documented on http://prebid.org?
• Other

Description of change

This pull request reinstates the Playground XYZ bid adapter with minor changes to make it compliant with Prebid v3.

I haven't submitted this as a "New bidder adapter" as our test parameters / dev docs remain unchanged.

[monofonik]

Note that the failing CircleCI tests appear to be unrelated to this PR

[Fawke]

Hi @monofonik,

Thanks for making your adapter 3.0 compliant.

There are a few issues that I wanted to bring to your notice.

• Your adapter is failing when I use the hello world example and plug in your given parameters in the md file.

• Is there any specific reason for modifying appnexusBidAdapter_spec.js

[monofonik]

Thanks @Fawke I've addressed the erroneous change to appnexusBidAdapter_spec.js and also corrected our test params with the correct ad unit code.

Can you try the hello world test again? Couple of notes:

• depending on your geo you may have to increase PREBID_TIMEOUT
• our bidder wont respond with demand unless it detects a valid hostname, so you may need to e.g. update your hosts file with a dummy domain name pointing to your local machine (see screeny below)

[Fawke]

Hi @monofonik,

Thanks for updating the test parameters, now, am able to get a bid back. While checking the response headers, I noticed that the content-encoding is not set to gzip. We require all our bid adapters to compress the their response before sending it to the client for a better performance.

Is it possible to make this change and send the response gzipped?

[monofonik]

Hi @Fawke no problem - confirming our bid responses are now gzipped.

[Fawke]

@monofonik Thanks for making the change.