Since Phraseanet APIs does not provide any public endpoint, all requests need to be signed, it results in the transmission of plain text credentials in the HTTP request, to protect this sensitive information, the authorization server must require the use of a transport-layer security mechanism when sending requests to any Phraseanet API endpoints.
To improve the loading time of pages and reduce load for the network infrastructure as well as for servers and HTTP clients. You should use HTTP 1.1 and pipelining your requests into one TCP connection.