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„ƒYZdS(sLow-level server communication.iÿÿÿÿN(tfetch(tbpickle(tformat_delta(t
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HTTPTransportcBsGeZdZdd„Zd„Zd„Zd„Zdded„Z	RS(sÇTransport makes a request to exchange message data over HTTP.

    @param url: URL of the remote Landscape server message system.
    @param pubkey: SSH public key used for secure communication.
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dt|ƒt|ƒttjƒ|ƒƒytj|ƒ}	Wntjd|ƒdSXtjƒjƒtjkr-tjdtj	|	ƒƒn|	S(s>Exchange message data with the server.

        @param payload: The object to send, it must be L{bpickle}-compatible.
        @param computer_id: The computer ID to send the message as (see
            also L{Identity}).
        @param exchange_token: The token that the server has given us at the
            last exchange. It's used to prove that we are still the same
            client.

        @type: C{dict}
        @return: The server's response to sent message or C{None} in case
            of error.

        @note: This code is thread safe (HOPEFULLY).

        sSending payload:
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