+ * string $pinned_publickey
+ File with a public key to pin. Available if libcurl is v7.39.0 or more recent.
+ * int $tlsauthtype
+ TLS_AUTH_* constant. Available if libcurl is v7.21.4 or more recent.
+ * string $tlsauthuser
+ TLS-SRP username. Available if libcurl is v7.21.4 or more recent.
+ * string $lsauthpass
+ TLS-SRP password. Available if libcurl is v7.21.4 or more recent.
+ * bool $verifystatus
+ Enable OCSP. Available if libcurl is v7.41.0 or more recent and was build with openssl, gnutls or nss support.
+
+## Configuration:
+
+* int $maxconnects
+ Size of the connection cache.
+* int $max_host_connections
+ Maximum number of connections to a single host. Available if libcurl is v7.30.0 or more recent.
+* int $max_pipeline_length
+ Maximum number of requests in a pipeline. Available if libcurl is v7.30.0 or more recent.
+* int $max_total_connections
+ Maximum number of simultaneous open connections of this client. Available if libcurl is v7.30.0 or more recent.
+* bool $pipelining
+ Whether to enable HTTP/1.1 pipelining.
+* int $chunk_length_penalty_size
+ Chunk length threshold for pipelining; no more requests on this pipeline if exceeded. Available if libcurl is v7.30.0 or more recent.
+* int $content_length_penalty_size
+ Size threshold for pipelining; no more requests on this pipeline if exceeded. Available if libcurl is v7.30.0 or more recent.
+* array $pipelining_server_bl
+ Simple list of server software names to blacklist for pipelining. Available if libcurl is v7.30.0 or more recent.
+* array $pipelining_site_bl
+ Simple list of server host names to blacklist for pipelining. Available if libcurl is v7.30.0 or more recent.
+* bool $use_eventloop
+ Whether to use an event loop. Available if pecl/http was built with libevent support.