I am using the NodeJS AWS SDK to generate a presigned S3 URL. The docs give an [example of generating a presigned URL](https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#getSignedUrl-property).

Here is my exact code (with sensitive info omitted):

    const AWS = require(&#39;aws-sdk&#39;)
    
    const s3 = new AWS.S3()
    AWS.config.update({accessKeyId: &#39;id-omitted&#39;, secretAccessKey: &#39;key-omitted&#39;})
    
    // Tried with and without this. Since s3 is not region-specific, I don&#39;t
    // think it should be necessary.
    // AWS.config.update({region: &#39;us-west-2&#39;})
    
    const myBucket = &#39;bucket-name&#39;
    const myKey = &#39;file-name.pdf&#39;
    const signedUrlExpireSeconds = 60 * 5
    
    const url = s3.getSignedUrl(&#39;getObject&#39;, {
        Bucket: myBucket,
        Key: myKey,
        Expires: signedUrlExpireSeconds
    })
    
    console.log(url)

The URL that generates looks like this:

    https://bucket-name.s3-us-west-2.amazonaws.com/file-name.pdf?AWSAccessKeyId=[access-key-omitted]&amp;Expires=1470666057&amp;Signature=[signature-omitted]

I am copying that URL into my browser and getting the following response:

    &lt;Error&gt;
      &lt;Code&gt;NoSuchBucket&lt;/Code&gt;
      &lt;Message&gt;The specified bucket does not exist&lt;/Message&gt;
      &lt;BucketName&gt;[bucket-name-omitted]&lt;/BucketName&gt;
      &lt;RequestId&gt;D1A358D276305A5C&lt;/RequestId&gt;
      &lt;HostId&gt;
        bz2OxmZcEM2173kXEDbKIZrlX508qSv+CVydHz3w6FFPFwC0CtaCa/TqDQYDmHQdI1oMlc07wWk=
      &lt;/HostId&gt;
    &lt;/Error&gt;

I know the bucket exists. When I navigate to this item via the AWS Web GUI and double click on it, it opens the object with URL and works just fine:

    https://s3-us-west-2.amazonaws.com/[bucket-name-omitted]/[file-name-omitted].pdf?X-Amz-Date=20160808T141832Z&amp;X-Amz-Expires=300&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Signature=[signature-omitted]&amp;X-Amz-Credential=ASIAJKXDBR5CW3XXF5VQ/20160808/us-west-2/s3/aws4_request&amp;X-Amz-SignedHeaders=Host&amp;x-amz-security-token=[really-long-key]

So I am led to believe that I must be doing something wrong with how I&#39;m using the SDK.

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Nodejs AWS SDK S3 Generate Presigned URL