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Response

Last updated: 2023-09-11 17:53:41
    The Response API represents the response to an HTTP request. It is designed based on the standard Web API Response.
    Note
    In Edge Functions, you can obtain a Response object by using the following methods:
    Create a Response object by using the Response constructor API. This object can be used as the value of the response parameter in the event.respondWith method.
    Use Fetch to obtain a Response object.

    Constructor API

    const response = new Response(body?: string | ArrayBuffer | Blob | ReadableStream | null | undefined, init?: ResponseInit);

    Parameters

    Parameter
    Type
    Required
    Description
    body
    string | ArrayBuffer | Blob | ReadableStream | null | undefined
    Yes
    The body of the Response object.
    init
    No
    The initial configuration items of the Response object.

    ResponseInit

    Parameter
    Type
    Required
    Description
    status
    number
    No
    The status code for the response.
    statusText
    string
    No
    The status message for the response. The maximum length is 4,095 bytes. If the length exceeds the upper limit, the extra content will be truncated.
    headers
    No
    The headers associated with the response.

    Attributes

    body

    // response.body
    readonly body: ReadableStream;
    The response body. For more information, see ReadableStream.

    bodyUsed

    // response.bodyUsed
    readonly bodyUsed: boolean;
    Indicates whether the response body is read.

    headers

    // response.headers
    readonly headers: Headers;
    The response headers. For more information, see Headers.

    ok

    // response.ok
    readonly ok: boolean;
    Indicates whether the response was successful. If the status code ranges from 200 to 299, the response was successful.

    status

    // response.status
    readonly status: number;
    The status code for the response.

    statusText

    // response.statusText
    readonly statusText: string;
    The status message for the response.

    url

    // response.url
    readonly url: string;
    The URL of the response.

    redirected

    // response.redirected
    readonly redirected: boolean;
    Indicates whether the response is the result of a redirect.

    redirectUrls

    // response.redirectUrls
    readonly redirectUrls: Array<String>
    All URLs for redirection.

    Methods

    Note
    If the size of the HTTP body obtained by using a method exceeds 1 MB, the OverSize exception will be thrown. In this case, we recommend that you use response.body to read the response body in streaming mode. For more information, see ReadableStream.

    arrayBuffer

    response.arrayBuffer(): Promise<ArrayBuffer>;
    The arrayBuffer() method takes a Response stream, reads it to completion, and returns a promise that resolves with an ArrayBuffer.

    blob

    response.blob(): Promise<Blob>;
    The blob() method takes a Response stream, reads it to completion, and returns a promise that resolves with a Blob.

    clone

    response.clone(copyHeaders?: boolean): Request;
    The clone() method creates a clone of a response object.

    Parameters

    Parameter
    Type
    Required
    Description
    copyHeaders
    boolean
    No
    Specifies whether to copy the response headers of the original object. Default value: false. Valid values:
    true
    Copy the response headers of the original object.
    false
    Reference the response headers of the original object.

    json

    response.json(): Promise<object>;
    The json() method takes a Response stream, reads it to completion, and returns a promise which resolves with the parsing result of the body text as json.

    text

    response.text(): Promise<string>;
    The text() method takes a Response stream, reads it to completion, and returns a promise that resolves with a String.

    formData

    response.formData(): Promise<FormData>;
    The formData() method takes a Response stream, reads it to completion, and returns a promise that resolves with a FormData.
    

    Static Methods

    error

    Response.error(): Response;
    The error() method returns a new Response object that contains network error information.

    redirect

    Response.redirect(url: string | URL, status?: number): Response;
    The redirect() method returns a Response object resulting in a redirect to the specified URL.

    Parameters

    Parameter
    Type
    Required
    Description
    url
    string
    Yes
    Redirect URL
    status
    number
    No
    Status code for the response. Valid values: 301, 302, 303, 307, and 308. Default value: 302.

    Sample Code

    addEventListener('fetch', (event) => {
    const response = new Response('hello world');
    event.respondWith(response);
    });

    References

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