Fix Gateway / Playground Query Plan view #3418
Merged
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This commit revisits recent changes from PR #3376 which broke
Playground's ability to detect support for the Query Plan view.
Playground's internals decide that QP is supported based on the
response from the first introspection query. The previously mentioned
PR broke this by not providing any
response.extensions.__queryPlanExperimental
at all. This makes sense for
debug
mode, but Playground still needssome form of hint to know that it's supported and continue sending
the
Apollo-Query-Plan-Experimental
header.