I'm currently getting the info about the files with GET, will it be faster if I rewrite it using HEAD request? Cause I close the connection after the first response.
A HEAD response only includes the HTTP headers but no body - it is generally faster to just use a HEAD if you do not use any information in the body that would have normally transferred in a GET response - if there was no body to begin with it should not make a difference.
Also from here:
The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request SHOULD be identical to the information sent in response to a GET request. This method can be used for obtaining metainformation about the entity implied by the request without transferring the entity-body itself. This method is often used for testing hypertext links for validity, accessibility, and recent modification.