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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Response/blob below:

Response: blob() method - Web APIs

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The blob() method of the Response interface takes a Response stream and reads it to completion. It returns a promise that resolves with a Blob.

None.

Note: If the Response has a Response.type of "opaque", the resulting Blob will have a Blob.size of 0 and a Blob.type of empty string "", which renders it useless for methods like URL.createObjectURL().

A promise that resolves with a Blob.

DOMException AbortError

The request was aborted.

TypeError

Thrown for one of the following reasons:

• The response body is disturbed or locked.
• There was an error decoding the body content (for example, because the Content-Encoding header is incorrect).

In our fetch request example (run fetch request live), we create a new request using the Request() constructor, then use it to fetch a JPG. When the fetch is successful, we read a Blob out of the response using blob(), put it into an object URL using URL.createObjectURL(), and then set that URL as the source of an <img> element to display the image.

const myImage = document.querySelector("img");

const myRequest = new Request("flowers.jpg");

fetch(myRequest)
  .then((response) => response.blob())
  .then((myBlob) => {
    const objectURL = URL.createObjectURL(myBlob);
    myImage.src = objectURL;
  });

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