AgentOptions

If set, this will be called when a client opens a connection using the ALPN extension. One argument will be passed to the callback: an object containing servername and protocols fields, respectively containing the server name from the SNI extension (if any) and an array of ALPN protocol name strings. The callback must return either one of the strings listed in protocols, which will be returned to the client as the selected ALPN protocol, or undefined, to reject the connection with a fatal alert. If a string is returned that does not match one of the client's ALPN protocols, an error will be thrown. This option cannot be used with the ALPNProtocols option, and setting both options will throw an error.

An array of strings or a Buffer naming possible ALPN protocols. (Protocols should be ordered by their priority.)

Optionally override the trusted CA certificates. Default is to trust the well-known CAs curated by Mozilla. Mozilla's CAs are completely replaced when CAs are explicitly specified using this option.

Cert chains in PEM format. One cert chain should be provided per private key. Each cert chain should consist of the PEM formatted certificate for a provided private key, followed by the PEM formatted intermediate certificates (if any), in order, and not including the root CA (the root CA must be pre-known to the peer, see ca). When providing multiple cert chains, they do not have to be in the same order as their private keys in key. If the intermediate certificates are not provided, the peer will not be able to validate the certificate, and the handshake will fail.

Cipher suite specification, replacing the default. For more information, see modifying the default cipher suite. Permitted ciphers can be obtained via tls.getCiphers(). Cipher names must be uppercased in order for OpenSSL to accept them.

Name of an OpenSSL engine which can provide the client certificate.

PEM formatted CRLs (Certificate Revocation Lists).

'auto' or custom Diffie-Hellman parameters, required for non-ECDHE perfect forward secrecy. If omitted or invalid, the parameters are silently discarded and DHE ciphers will not be available. ECDHE-based perfect forward secrecy will still be available.

A string describing a named curve or a colon separated list of curve NIDs or names, for example P-521:P-384:P-256, to use for ECDH key agreement. Set to auto to select the curve automatically. Use crypto.getCurves() to obtain a list of available curve names. On recent releases, openssl ecparam -list_curves will also display the name and description of each available elliptic curve. Default: tls.DEFAULT_ECDH_CURVE.

When enabled, TLS packet trace information is written to stderr. This can be used to debug TLS connection problems.

Attempt to use the server's cipher suite preferences instead of the client's. When true, causes SSL_OP_CIPHER_SERVER_PREFERENCE to be set in secureOptions

Keep sockets around in a pool to be used by other requests in the future. Default = false

When using HTTP KeepAlive, how often to send TCP KeepAlive packets over sockets being kept alive. Default = 1000. Only relevant if keepAlive is set to true.

Private keys in PEM format. PEM allows the option of private keys being encrypted. Encrypted keys will be decrypted with options.passphrase. Multiple keys using different algorithms can be provided either as an array of unencrypted key strings or buffers, or an array of objects in the form {pem: , passphrase: }. The object form can only occur in an array. object.passphrase is optional. Encrypted keys will be decrypted with object.passphrase if provided, or options.passphrase if it is not.

Maximum number of sockets to leave open in a free state. Only relevant if keepAlive is set to true. Default = 256.

Maximum number of sockets to allow per host. Default for Node 0.10 is 5, default for Node 0.12 is Infinity

Maximum number of sockets allowed for all hosts in total. Each request will use a new socket until the maximum is reached. Default: Infinity.

Optionally set the maximum TLS version to allow. One of 'TLSv1.3', 'TLSv1.2', 'TLSv1.1', or 'TLSv1'. Cannot be specified along with the secureProtocol option, use one or the other. Default: 'TLSv1.3', unless changed using CLI options. Using --tls-max-v1.2 sets the default to 'TLSv1.2'. Using --tls-max-v1.3 sets the default to 'TLSv1.3'. If multiple of the options are provided, the highest maximum is used.

Optionally set the minimum TLS version to allow. One of 'TLSv1.3', 'TLSv1.2', 'TLSv1.1', or 'TLSv1'. Cannot be specified along with the secureProtocol option, use one or the other. It is not recommended to use less than TLSv1.2, but it may be required for interoperability. Default: 'TLSv1.2', unless changed using CLI options. Using --tls-v1.0 sets the default to 'TLSv1'. Using --tls-v1.1 sets the default to 'TLSv1.1'. Using --tls-min-v1.3 sets the default to 'TLSv1.3'. If multiple of the options are provided, the lowest minimum is used.

If specified, incoming data is stored in a single buffer and passed to the supplied callback when data arrives on the socket. Note: this will cause the streaming functionality to not provide any data, however events like 'error', 'end', and 'close' will still be emitted as normal and methods like pause() and resume() will also behave as expected.

Shared passphrase used for a single private key and/or a PFX.

PFX or PKCS12 encoded private key and certificate chain. pfx is an alternative to providing key and cert individually. PFX is usually encrypted, if it is, passphrase will be used to decrypt it. Multiple PFX can be provided either as an array of unencrypted PFX buffers, or an array of objects in the form {buf: , passphrase: }. The object form can only occur in an array. object.passphrase is optional. Encrypted PFX will be decrypted with object.passphrase if provided, or options.passphrase if it is not.

Name of an OpenSSL engine to get private key from. Should be used together with privateKeyIdentifier.

Identifier of a private key managed by an OpenSSL engine. Should be used together with privateKeyEngine. Should not be set together with key, because both options define a private key in different ways.

When negotiating TLS-PSK (pre-shared keys), this function is called with optional identity hint provided by the server or null in case of TLS 1.3 where hint was removed. It will be necessary to provide a custom tls.checkServerIdentity() for the connection as the default one will try to check hostname/IP of the server against the certificate but that's not applicable for PSK because there won't be a certificate present. More information can be found in the RFC 4279.

If true the server will reject any connection which is not authorized with the list of supplied CAs. This option only has an effect if requestCert is true.

If true the server will request a certificate from clients that connect and attempt to verify that certificate. Defaults to false.

Scheduling strategy to apply when picking the next free socket to use.

An optional TLS context object from tls.createSecureContext()

Optionally affect the OpenSSL protocol behavior, which is not usually necessary. This should be used carefully if at all! Value is a numeric bitmask of the SSL_OP_* options from OpenSSL Options

Legacy mechanism to select the TLS protocol version to use, it does not support independent control of the minimum and maximum version, and does not support limiting the protocol to TLSv1.3. Use minVersion and maxVersion instead. The possible values are listed as SSL_METHODS, use the function names as strings. For example, use 'TLSv1_1_method' to force TLS version 1.1, or 'TLS_method' to allow any TLS protocol version up to TLSv1.3. It is not recommended to use TLS versions less than 1.2, but it may be required for interoperability. Default: none, see minVersion.

Opaque identifier used by servers to ensure session state is not shared between applications. Unused by clients.

The number of seconds after which a TLS session created by the server will no longer be resumable. See Session Resumption for more information. Default: 300.

Colon-separated list of supported signature algorithms. The list can contain digest algorithms (SHA256, MD5 etc.), public key algorithms (RSA-PSS, ECDSA etc.), combination of both (e.g 'RSA+SHA384') or TLS v1.3 scheme names (e.g. rsa_pss_pss_sha512).

SNICallback(servername, cb) A function that will be called if the client supports SNI TLS extension. Two arguments will be passed when called: servername and cb. SNICallback should invoke cb(null, ctx), where ctx is a SecureContext instance. (tls.createSecureContext(...) can be used to get a proper SecureContext.) If SNICallback wasn't provided the default callback with high-level API will be used (see below).

48-bytes of cryptographically strong pseudo-random data. See Session Resumption for more information.

Socket timeout in milliseconds. This will set the timeout after the socket is connected.