A TODO

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+A few things that could be hacked on.
+
+Remove httpsig key fetching from the input path.
+	If the key is known, check signature and reply 200 or 401.
+	If the key is unknown, immediately reply 202 and process later.
+
+The gob encoding for backend rpc uses more memory than needed.
+	A custom encoding could reduce allocations.
+	Maybe the backend could fetch the data itself.
+
+