feat: flexible canister http outcalls#254
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Summary
flexible_http_requestmanagement canister method: a variant ofhttp_requestwhere nodes return their individual HTTP responses to the caller instead of reaching consensus.Supports configurable replication via an optional replication argument (
min_responses,max_responses,total_requests). Returns a vector of responses or a structured error with a global error code and per-node resource reports.pricing_versionfield onhttp_request: adds an optionalpricing_versionfield (1or2). Version 1 is now deprecated; version 2 ignoresmax_response_bytesand refunds unused cycles based on actual execution cost.ic0.cost_http_request_v2System API: replaces the deprecatedic0.cost_http_request. Accepts a Candid-encoded parameter record to compute the cost of an outcall at pricing version2.ic0.subnet_self_node_countSystem API: returns the number of nodes currently on the subnet. Useful for callers computing valid replication bounds forflexible_http_request.