This enables bundling multiple JSON-RPC requests within a single HTTP request, inside a JSON array. The response is a JSON array, containing one JSON-RPC response per input request.
Specification: http://www.jsonrpc.org/specification#batch
Testing notes: I have done a quick "it works" batch test with curl, as well as the usual RPC testing to make sure nothing broke. More elaborate testing is welcome.
Trying the batch examples at http://www.jsonrpc.org/specification ... the implementation isn't matching the spec.
E.g.
curl --user abc:123 --data-binary '[1,2,3]' -H 'content-type: text/plain;' http://127.0.0.1:9000/
... is returning error -32700, "value is type int, expected obj" instead of -32600, "Invalid request".
Rebased, and fixed bug reported by @gavinandresen (note: turned out not to be a policy decision, as I claimed on IRC)
This prepares for JSON-RPC 2.0 batches.
If the top-level object is an array, it is assumed to be an array of
JSON-RPC requests. An array is returned, containing one response (error or
not) per request, in the order submitted.
In a slight change in semantics, batched requests -always- return
an HTTP 200 OK status, even ones full of invalid or incorrect requests.