Server | typescript

Hierarchy

Server
- Server
  - Http2SecureServer
  - Server

Index

Constructors

constructor

Properties

Constructors

constructor

new Server(secureConnectionListener?: function): Server
new Server(options: TlsOptions, secureConnectionListener?: function): Server

Overrides Server.constructor
- Defined in node_modules/@types/node/tls.d.ts:474
Parameters
- Optional secureConnectionListener: function
  - - (socket: TLSSocket): void
    - Parameters
      - socket: TLSSocket
      Returns void
Returns Server
Overrides Server.constructor
- Defined in node_modules/@types/node/tls.d.ts:475
Parameters
- options: TlsOptions
- Optional secureConnectionListener: function
  - - (socket: TLSSocket): void
    - Parameters
      - socket: TLSSocket
      Returns void
Returns Server

Properties

connections

connections: number

listening

listening: boolean

maxConnections

maxConnections: number

Methods

addContext

addContext(hostName: string, credentials: SecureContextOptions): void

- Defined in node_modules/@types/node/tls.d.ts:483
The server.addContext() method adds a secure context that will be used if the client request's SNI name matches the supplied hostname (or wildcard).

Parameters
- hostName: string
- credentials: SecureContextOptions
Returns void

addListener

addListener(event: string, listener: function): this
addListener(event: "tlsClientError", listener: function): this
addListener(event: "newSession", listener: function): this
addListener(event: "OCSPRequest", listener: function): this
addListener(event: "resumeSession", listener: function): this
addListener(event: "secureConnection", listener: function): this
addListener(event: "keylog", listener: function): this

Overrides Server.addListener
- Defined in node_modules/@types/node/tls.d.ts:511
events.EventEmitter
1. tlsClientError
2. newSession
3. OCSPRequest
4. resumeSession
5. secureConnection
6. keylog
Parameters
- event: string
- listener: function
  - - (...args: any[]): void
    - Parameters
      - Rest ...args: any[]
      Returns void
Returns this
Overrides Server.addListener
- Defined in node_modules/@types/node/tls.d.ts:512
Parameters
- event: "tlsClientError"
- listener: function
  - - (err: Error, tlsSocket: TLSSocket): void
    - Parameters
      - err: Error
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.addListener
- Defined in node_modules/@types/node/tls.d.ts:513
Parameters
- event: "newSession"
- listener: function
  - - (sessionId: Buffer, sessionData: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - sessionData: Buffer
      - callback: function
        
        (err: Error, resp: Buffer): void
        
        Parameters
        
        err: Error
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.addListener
- Defined in node_modules/@types/node/tls.d.ts:514
Parameters
- event: "OCSPRequest"
- listener: function
  - - (certificate: Buffer, issuer: Buffer, callback: function): void
    - Parameters
      - certificate: Buffer
      - issuer: Buffer
      - callback: function
        
        (err: Error | null, resp: Buffer): void
        
        Parameters
        
        err: Error | null
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.addListener
- Defined in node_modules/@types/node/tls.d.ts:515
Parameters
- event: "resumeSession"
- listener: function
  - - (sessionId: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - callback: function
        
        (err: Error, sessionData: Buffer): void
        
        Parameters
        
        err: Error
        
        sessionData: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.addListener
- Defined in node_modules/@types/node/tls.d.ts:516
Parameters
- event: "secureConnection"
- listener: function
  - - (tlsSocket: TLSSocket): void
    - Parameters
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.addListener
- Defined in node_modules/@types/node/tls.d.ts:517
Parameters
- event: "keylog"
- listener: function
  - - (line: Buffer, tlsSocket: TLSSocket): void
    - Parameters
      - line: Buffer
      - tlsSocket: TLSSocket
      Returns void
Returns this

address

address(): AddressInfo | string | null

Inherited from Server.address
- Defined in node_modules/@types/node/net.d.ts:216
Returns AddressInfo | string | null

close

close(callback?: function): this

Inherited from Server.close
- Defined in node_modules/@types/node/net.d.ts:215
Parameters
- Optional callback: function
  - - (err?: Error): void
    - Parameters
      - Optional err: Error
      Returns void
Returns this

emit

emit(event: string | symbol, ...args: any[]): boolean
emit(event: "tlsClientError", err: Error, tlsSocket: TLSSocket): boolean
emit(event: "newSession", sessionId: Buffer, sessionData: Buffer, callback: function): boolean
emit(event: "OCSPRequest", certificate: Buffer, issuer: Buffer, callback: function): boolean
emit(event: "resumeSession", sessionId: Buffer, callback: function): boolean
emit(event: "secureConnection", tlsSocket: TLSSocket): boolean
emit(event: "keylog", line: Buffer, tlsSocket: TLSSocket): boolean

Overrides Server.emit
- Defined in node_modules/@types/node/tls.d.ts:519
Parameters
- event: string | symbol
- Rest ...args: any[]
Returns boolean
Overrides Server.emit
- Defined in node_modules/@types/node/tls.d.ts:520
Parameters
- event: "tlsClientError"
- err: Error
- tlsSocket: TLSSocket
Returns boolean
Overrides Server.emit
- Defined in node_modules/@types/node/tls.d.ts:521
Parameters
- event: "newSession"
- sessionId: Buffer
- sessionData: Buffer
- callback: function
  - - (err: Error, resp: Buffer): void
    - Parameters
      - err: Error
      - resp: Buffer
      Returns void
Returns boolean
Overrides Server.emit
- Defined in node_modules/@types/node/tls.d.ts:522
Parameters
- event: "OCSPRequest"
- certificate: Buffer
- issuer: Buffer
- callback: function
  - - (err: Error | null, resp: Buffer): void
    - Parameters
      - err: Error | null
      - resp: Buffer
      Returns void
Returns boolean
Overrides Server.emit
- Defined in node_modules/@types/node/tls.d.ts:523
Parameters
- event: "resumeSession"
- sessionId: Buffer
- callback: function
  - - (err: Error, sessionData: Buffer): void
    - Parameters
      - err: Error
      - sessionData: Buffer
      Returns void
Returns boolean
Overrides Server.emit
- Defined in node_modules/@types/node/tls.d.ts:524
Parameters
- event: "secureConnection"
- tlsSocket: TLSSocket
Returns boolean
Overrides Server.emit
- Defined in node_modules/@types/node/tls.d.ts:525
Parameters
- event: "keylog"
- line: Buffer
- tlsSocket: TLSSocket
Returns boolean

eventNames

eventNames(): Array<string | symbol>

Inherited from EventEmitter.eventNames
- Defined in node_modules/@types/node/events.d.ts:77
Returns Array<string | symbol>

getConnections

getConnections(cb: function): void

Inherited from Server.getConnections
- Defined in node_modules/@types/node/net.d.ts:217
Parameters
- cb: function
  - - (error: Error | null, count: number): void
    - Parameters
      - error: Error | null
      - count: number
      Returns void
Returns void

getMaxListeners

getMaxListeners(): number

Inherited from EventEmitter.getMaxListeners
- Defined in node_modules/@types/node/events.d.ts:69
Returns number

getTicketKeys

getTicketKeys(): Buffer

- Defined in node_modules/@types/node/tls.d.ts:487
Returns the session ticket keys.

Returns Buffer

listen

listen(port?: number, hostname?: string, backlog?: number, listeningListener?: function): this
listen(port?: number, hostname?: string, listeningListener?: function): this
listen(port?: number, backlog?: number, listeningListener?: function): this
listen(port?: number, listeningListener?: function): this
listen(path: string, backlog?: number, listeningListener?: function): this
listen(path: string, listeningListener?: function): this
listen(options: ListenOptions, listeningListener?: function): this
listen(handle: any, backlog?: number, listeningListener?: function): this
listen(handle: any, listeningListener?: function): this

Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:206
Parameters
- Optional port: number
- Optional hostname: string
- Optional backlog: number
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:207
Parameters
- Optional port: number
- Optional hostname: string
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:208
Parameters
- Optional port: number
- Optional backlog: number
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:209
Parameters
- Optional port: number
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:210
Parameters
- path: string
- Optional backlog: number
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:211
Parameters
- path: string
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:212
Parameters
- options: ListenOptions
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:213
Parameters
- handle: any
- Optional backlog: number
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this
Inherited from Server.listen
- Defined in node_modules/@types/node/net.d.ts:214
Parameters
- handle: any
- Optional listeningListener: function
  - - (): void
    - Returns void
Returns this

listenerCount

listenerCount(event: string | symbol): number

Inherited from EventEmitter.listenerCount
- Defined in node_modules/@types/node/events.d.ts:73
Parameters
- event: string | symbol
Returns number

listeners

listeners(event: string | symbol): Function[]

Inherited from EventEmitter.listeners
- Defined in node_modules/@types/node/events.d.ts:70
Parameters
- event: string | symbol
Returns Function[]

off

off(event: string | symbol, listener: function): this

Inherited from EventEmitter.off
- Defined in node_modules/@types/node/events.d.ts:66
Parameters
- event: string | symbol
- listener: function
  - - (...args: any[]): void
    - Parameters
      - Rest ...args: any[]
      Returns void
Returns this

on

on(event: string, listener: function): this
on(event: "tlsClientError", listener: function): this
on(event: "newSession", listener: function): this
on(event: "OCSPRequest", listener: function): this
on(event: "resumeSession", listener: function): this
on(event: "secureConnection", listener: function): this
on(event: "keylog", listener: function): this

Overrides Server.on
- Defined in node_modules/@types/node/tls.d.ts:527
Parameters
- event: string
- listener: function
  - - (...args: any[]): void
    - Parameters
      - Rest ...args: any[]
      Returns void
Returns this
Overrides Server.on
- Defined in node_modules/@types/node/tls.d.ts:528
Parameters
- event: "tlsClientError"
- listener: function
  - - (err: Error, tlsSocket: TLSSocket): void
    - Parameters
      - err: Error
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.on
- Defined in node_modules/@types/node/tls.d.ts:529
Parameters
- event: "newSession"
- listener: function
  - - (sessionId: Buffer, sessionData: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - sessionData: Buffer
      - callback: function
        
        (err: Error, resp: Buffer): void
        
        Parameters
        
        err: Error
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.on
- Defined in node_modules/@types/node/tls.d.ts:530
Parameters
- event: "OCSPRequest"
- listener: function
  - - (certificate: Buffer, issuer: Buffer, callback: function): void
    - Parameters
      - certificate: Buffer
      - issuer: Buffer
      - callback: function
        
        (err: Error | null, resp: Buffer): void
        
        Parameters
        
        err: Error | null
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.on
- Defined in node_modules/@types/node/tls.d.ts:531
Parameters
- event: "resumeSession"
- listener: function
  - - (sessionId: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - callback: function
        
        (err: Error, sessionData: Buffer): void
        
        Parameters
        
        err: Error
        
        sessionData: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.on
- Defined in node_modules/@types/node/tls.d.ts:532
Parameters
- event: "secureConnection"
- listener: function
  - - (tlsSocket: TLSSocket): void
    - Parameters
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.on
- Defined in node_modules/@types/node/tls.d.ts:533
Parameters
- event: "keylog"
- listener: function
  - - (line: Buffer, tlsSocket: TLSSocket): void
    - Parameters
      - line: Buffer
      - tlsSocket: TLSSocket
      Returns void
Returns this

once

once(event: string, listener: function): this
once(event: "tlsClientError", listener: function): this
once(event: "newSession", listener: function): this
once(event: "OCSPRequest", listener: function): this
once(event: "resumeSession", listener: function): this
once(event: "secureConnection", listener: function): this
once(event: "keylog", listener: function): this

Overrides Server.once
- Defined in node_modules/@types/node/tls.d.ts:535
Parameters
- event: string
- listener: function
  - - (...args: any[]): void
    - Parameters
      - Rest ...args: any[]
      Returns void
Returns this
Overrides Server.once
- Defined in node_modules/@types/node/tls.d.ts:536
Parameters
- event: "tlsClientError"
- listener: function
  - - (err: Error, tlsSocket: TLSSocket): void
    - Parameters
      - err: Error
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.once
- Defined in node_modules/@types/node/tls.d.ts:537
Parameters
- event: "newSession"
- listener: function
  - - (sessionId: Buffer, sessionData: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - sessionData: Buffer
      - callback: function
        
        (err: Error, resp: Buffer): void
        
        Parameters
        
        err: Error
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.once
- Defined in node_modules/@types/node/tls.d.ts:538
Parameters
- event: "OCSPRequest"
- listener: function
  - - (certificate: Buffer, issuer: Buffer, callback: function): void
    - Parameters
      - certificate: Buffer
      - issuer: Buffer
      - callback: function
        
        (err: Error | null, resp: Buffer): void
        
        Parameters
        
        err: Error | null
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.once
- Defined in node_modules/@types/node/tls.d.ts:539
Parameters
- event: "resumeSession"
- listener: function
  - - (sessionId: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - callback: function
        
        (err: Error, sessionData: Buffer): void
        
        Parameters
        
        err: Error
        
        sessionData: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.once
- Defined in node_modules/@types/node/tls.d.ts:540
Parameters
- event: "secureConnection"
- listener: function
  - - (tlsSocket: TLSSocket): void
    - Parameters
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.once
- Defined in node_modules/@types/node/tls.d.ts:541
Parameters
- event: "keylog"
- listener: function
  - - (line: Buffer, tlsSocket: TLSSocket): void
    - Parameters
      - line: Buffer
      - tlsSocket: TLSSocket
      Returns void
Returns this

prependListener

prependListener(event: string, listener: function): this
prependListener(event: "tlsClientError", listener: function): this
prependListener(event: "newSession", listener: function): this
prependListener(event: "OCSPRequest", listener: function): this
prependListener(event: "resumeSession", listener: function): this
prependListener(event: "secureConnection", listener: function): this
prependListener(event: "keylog", listener: function): this

Overrides Server.prependListener
- Defined in node_modules/@types/node/tls.d.ts:543
Parameters
- event: string
- listener: function
  - - (...args: any[]): void
    - Parameters
      - Rest ...args: any[]
      Returns void
Returns this
Overrides Server.prependListener
- Defined in node_modules/@types/node/tls.d.ts:544
Parameters
- event: "tlsClientError"
- listener: function
  - - (err: Error, tlsSocket: TLSSocket): void
    - Parameters
      - err: Error
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.prependListener
- Defined in node_modules/@types/node/tls.d.ts:545
Parameters
- event: "newSession"
- listener: function
  - - (sessionId: Buffer, sessionData: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - sessionData: Buffer
      - callback: function
        
        (err: Error, resp: Buffer): void
        
        Parameters
        
        err: Error
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.prependListener
- Defined in node_modules/@types/node/tls.d.ts:546
Parameters
- event: "OCSPRequest"
- listener: function
  - - (certificate: Buffer, issuer: Buffer, callback: function): void
    - Parameters
      - certificate: Buffer
      - issuer: Buffer
      - callback: function
        
        (err: Error | null, resp: Buffer): void
        
        Parameters
        
        err: Error | null
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.prependListener
- Defined in node_modules/@types/node/tls.d.ts:547
Parameters
- event: "resumeSession"
- listener: function
  - - (sessionId: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - callback: function
        
        (err: Error, sessionData: Buffer): void
        
        Parameters
        
        err: Error
        
        sessionData: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.prependListener
- Defined in node_modules/@types/node/tls.d.ts:548
Parameters
- event: "secureConnection"
- listener: function
  - - (tlsSocket: TLSSocket): void
    - Parameters
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.prependListener
- Defined in node_modules/@types/node/tls.d.ts:549
Parameters
- event: "keylog"
- listener: function
  - - (line: Buffer, tlsSocket: TLSSocket): void
    - Parameters
      - line: Buffer
      - tlsSocket: TLSSocket
      Returns void
Returns this

prependOnceListener

prependOnceListener(event: string, listener: function): this
prependOnceListener(event: "tlsClientError", listener: function): this
prependOnceListener(event: "newSession", listener: function): this
prependOnceListener(event: "OCSPRequest", listener: function): this
prependOnceListener(event: "resumeSession", listener: function): this
prependOnceListener(event: "secureConnection", listener: function): this
prependOnceListener(event: "keylog", listener: function): this

Overrides Server.prependOnceListener
- Defined in node_modules/@types/node/tls.d.ts:551
Parameters
- event: string
- listener: function
  - - (...args: any[]): void
    - Parameters
      - Rest ...args: any[]
      Returns void
Returns this
Overrides Server.prependOnceListener
- Defined in node_modules/@types/node/tls.d.ts:552
Parameters
- event: "tlsClientError"
- listener: function
  - - (err: Error, tlsSocket: TLSSocket): void
    - Parameters
      - err: Error
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.prependOnceListener
- Defined in node_modules/@types/node/tls.d.ts:553
Parameters
- event: "newSession"
- listener: function
  - - (sessionId: Buffer, sessionData: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - sessionData: Buffer
      - callback: function
        
        (err: Error, resp: Buffer): void
        
        Parameters
        
        err: Error
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.prependOnceListener
- Defined in node_modules/@types/node/tls.d.ts:554
Parameters
- event: "OCSPRequest"
- listener: function
  - - (certificate: Buffer, issuer: Buffer, callback: function): void
    - Parameters
      - certificate: Buffer
      - issuer: Buffer
      - callback: function
        
        (err: Error | null, resp: Buffer): void
        
        Parameters
        
        err: Error | null
        
        resp: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.prependOnceListener
- Defined in node_modules/@types/node/tls.d.ts:555
Parameters
- event: "resumeSession"
- listener: function
  - - (sessionId: Buffer, callback: function): void
    - Parameters
      - sessionId: Buffer
      - callback: function
        
        (err: Error, sessionData: Buffer): void
        
        Parameters
        
        err: Error
        
        sessionData: Buffer
        
        Returns void
      Returns void
Returns this
Overrides Server.prependOnceListener
- Defined in node_modules/@types/node/tls.d.ts:556
Parameters
- event: "secureConnection"
- listener: function
  - - (tlsSocket: TLSSocket): void
    - Parameters
      - tlsSocket: TLSSocket
      Returns void
Returns this
Overrides Server.prependOnceListener
- Defined in node_modules/@types/node/tls.d.ts:557
Parameters
- event: "keylog"
- listener: function
  - - (line: Buffer, tlsSocket: TLSSocket): void
    - Parameters
      - line: Buffer
      - tlsSocket: TLSSocket
      Returns void
Returns this

rawListeners

rawListeners(event: string | symbol): Function[]

Inherited from EventEmitter.rawListeners
- Defined in node_modules/@types/node/events.d.ts:71
Parameters
- event: string | symbol
Returns Function[]

ref

ref(): this

Inherited from Server.ref
- Defined in node_modules/@types/node/net.d.ts:218
Returns this

removeAllListeners

removeAllListeners(event?: string | symbol): this

Inherited from EventEmitter.removeAllListeners
- Defined in node_modules/@types/node/events.d.ts:67
Parameters
- Optional event: string | symbol
Returns this

removeListener

removeListener(event: string | symbol, listener: function): this

Inherited from EventEmitter.removeListener
- Defined in node_modules/@types/node/events.d.ts:65
Parameters
- event: string | symbol
- listener: function
  - - (...args: any[]): void
    - Parameters
      - Rest ...args: any[]
      Returns void
Returns this

setMaxListeners

setMaxListeners(n: number): this

Inherited from EventEmitter.setMaxListeners
- Defined in node_modules/@types/node/events.d.ts:68
Parameters
- n: number
Returns this

setSecureContext

setSecureContext(details: SecureContextOptions): void

- Defined in node_modules/@types/node/tls.d.ts:494
The server.setSecureContext() method replaces the secure context of an existing server. Existing connections to the server are not interrupted.

Parameters
- details: SecureContextOptions
Returns void

setTicketKeys

setTicketKeys(keys: Buffer): void

- Defined in node_modules/@types/node/tls.d.ts:500
The server.setSecureContext() method replaces the secure context of an existing server. Existing connections to the server are not interrupted.

Parameters
- keys: Buffer
Returns void

unref

unref(): this

Inherited from Server.unref
- Defined in node_modules/@types/node/net.d.ts:219
Returns this

Hierarchy

Index

Constructors

Properties

Methods

Constructors

constructor

Parameters

Optional secureConnectionListener: function

Parameters

socket: TLSSocket

Returns void

Returns Server

Parameters

options: TlsOptions

Optional secureConnectionListener: function

Parameters

socket: TLSSocket

Returns void

Returns Server

Properties

connections

listening

maxConnections

Methods

addContext

Parameters

hostName: string

credentials: SecureContextOptions

Returns void

addListener

Parameters

event: string

listener: function

Parameters

Rest ...args: any[]

Returns void

Returns this

Parameters

event: "tlsClientError"

listener: function

Parameters

err: Error

tlsSocket: TLSSocket

Returns void

Returns this

Parameters

event: "newSession"

listener: function

Parameters

sessionId: Buffer

sessionData: Buffer

callback: function

Parameters

err: Error

resp: Buffer

Returns void

Returns void

Returns this

Parameters

event: "OCSPRequest"

listener: function

Parameters

certificate: Buffer

issuer: Buffer

callback: function

Parameters

err: Error | null

resp: Buffer

Returns void

Returns void

Returns this

Parameters

event: "resumeSession"

listener: function

Parameters

sessionId: Buffer

callback: function

Parameters

err: Error