Middleware to add tree hash of body to request
struct TreeHashMiddlewareCalculates a tree hash calculated from the SHA256 of each 1MB section of the request body and adds it to the request as a header value
import SotoCoreprotocol AWSMiddlewareProtocol : SendableMiddleware protocol, with function that takes a request, context and the next function to call
protocol Sendableinit(header: String) func handle(_ request: AWSHTTPRequest, context: AWSMiddlewareContext, next: AWSMiddlewareNextHandler) async throws -> AWSHTTPResponse