Yes, there is some overhead from transferring data over HTTP protocol between two virtual machines on the same machine.

HTTP is a communication protocol that adds a layer of abstraction over the data being transferred, which adds some overhead in terms of processing and latency. When the two virtual machines are on the same machine, the data still needs to be packaged and sent over the network interface, even though it's just a virtual network within the same physical machine. The overhead of using HTTP protocol in this case also includes parsing the HTTP headers, establishing the connection, and handling errors, which can slow the transfer process.

It's worth noting that there are other protocols such as TCP/IP or shared memory that can transfer data between virtual machines more efficiently, but they also come with their own set of trade-offs and limitations.
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