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Add example of variable coercion failure #289

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2 changes: 2 additions & 0 deletions spec/GraphQLOverHTTP.md
Original file line number Diff line number Diff line change
Expand Up @@ -615,6 +615,8 @@ If
raises a _GraphQL request error_, the server SHOULD NOT execute the request and
SHOULD return a status code of `200` (Okay).

For example a POST request body of `{"query": "{query getItem($id: String!) { item(id: $id) { id }}"}`, "variables": {"id": null}` would fail to satisfy the query document's expectation that `id` is non-nullable, and would fail at the variable coercion stage.
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##### Field errors encountered during execution

If the operation is executed and no _GraphQL request error_ is raised then the
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