This method will be responsible for creating the necessary HTTP client (whether single or multi) and will replace getServiceClient which creates a VRS instance. The interface should resemble what is done in getServiceClient() but just that instead of creating an instance of VRS, create an instance of a MultiHttpClient.
Interface should look like:
private function getMultiHttpClient() { ... }The method should return an instance of MultiHttpClient from our HttpRequestFactory service, where we can call ::run() or ::runMulti() on it depending on the endpoint we're calling/consuming.
NOTE: This method should also take care of the $wgVirtualRestConfig and $wgMathConcurrentReqs settings. This is so that, the client can be able to run batch, single and parallel requests depending on the configurations.
NOTE: also note that $wgVirtualRestConfig's parsoidCompat is always set to false when we're in RB mode and even RestbaseVirtualRESTService::__construct() sets this to false as well by default (meaning Math/Mathoid doesn't call Parsoid by default). We need to also pass in the value of $wgVirtualRestConfig['modules']['restbase'] to the MultiHttpClient.