Compress raw string using the deflate format.
Decompression of deflated string.
What encoding types to accept and their priority values.
What encoding the content used when it was compressed to send in the headers.
Whether the content be decoded based on the headers.
Whether decompression and compression are supported by the PHP version.
Whether proxy connection should be used.
Whether authentication should be used.
Retrieve the host for the proxy server.
Retrieve the port for the proxy server.
Retrieve the username for proxy authentication.
Retrieve the password for proxy authentication.
Retrieve authentication string for proxy authentication.
Retrieve header string for proxy authentication.
Determines whether the request should be sent through a proxy.