Skip to main content
Version: 3.28.0

FetchEvent

This is the event type for fetch events. It contains information about the fetch, including the request and how the receiver will treat the response. It provides the event.respondWith() method, which allows us to provide a response to this fetch.

Instance properties​

  • FetchEvent.request readonly
    • : The Request that was received by the application.
  • FetchEvent.client readonly
    • : Information about the downstream client that made the request. While these fields are always defined on Compute, they may be null when not available in testing environments such as Viceroy.
    • FetchEvent.client.address readonly
      • : A string representation of the IPv4 or IPv6 address of the downstream client.
    • FetchEvent.client.geo readonly
    • FetchEvent.client.tlsJA3MD5 readonly
      • : Either null or a string representation of the JA3 hash of the TLS ClientHello message.
    • FetchEvent.client.tlsCipherOpensslName readonly
      • : Either null or a string representation of the cipher suite used to secure the client TLS connection.
    • FetchEvent.client.tlsProtocol readonly
      • : Either null or a string representation of the TLS protocol version used to secure the client TLS connection.
    • FetchEvent.client.tlsClientCertificate readonly
      • : Either null or an ArrayBuffer containing the raw client certificate in the mutual TLS handshake message. It is in PEM format. Returns an empty ArrayBuffer if this is not mTLS or available.
    • FetchEvent.client.tlsClientHello readonly
      • : Either null or an ArrayBuffer containing the raw bytes sent by the client in the TLS ClientHello message.
  • FetchEvent.server readonly
    • : Information about the server receiving the request for the Fastly Compute service.
    • FetchEvent.server.address readonly
      • : A string representation of the IPv4 or IPv6 address of the server which received the request.

Instance methods​

  • FetchEvent.respondWith()
    • : Provide (a promise for) a response for this request.
  • FetchEvent.waitUntil()
    • : Extends the lifetime of the event. Used to notify the host environment of tasks that extend beyond the returning of a response, such as streaming and caching.