s3.headObject - where is ContentLength?

[dirkraft]

I'm trying to get the size of a file in S3 (from the browser) without actually downloading the entire file. It seems like Content-Length or response.ContentLength just isn't there. Am I misunderstanding how this works?

Here's a fiddle that gets a public-accessible file from S3 to show this. http://jsfiddle.net/dirkraft/9xbpoL8v/3/

Some environment details

Google Chrome   43.0.2357.124 (Official Build) (64-bit)
OS X Yosemite 10.10.3
aws-sdk-js 2.1.35

[dirkraft]

Added some environment details to the description

[lsegal]

@dirkraft if you're running this from the browser you have to ensure that you've exposed the headers you want in your CORS configuration (see the ExposeHeader field). The SDK will not be able to access any response headers that are not exposed in this way, as a CORS security restriction in your browser.

[dirkraft]

Thanks for the quick response. This is the CORS of s3://bits.dirkraft.com as of now (just added the ExposeHeader element)

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <AllowedMethod>HEAD</AllowedMethod>
        <MaxAgeSeconds>300</MaxAgeSeconds>
        <ExposeHeader>Content-Length</ExposeHeader>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

curl seems(?) to see a header named Content-Length

$ curl -XHEAD -v https://s3.amazonaws.com/bits.dirkraft.com/favicon.ico
* Hostname was NOT found in DNS cache
*   Trying 54.231.244.4...
* Connected to s3.amazonaws.com (54.231.244.4) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
* Server certificate: s3.amazonaws.com
* Server certificate: VeriSign Class 3 Secure Server CA - G3
* Server certificate: VeriSign Class 3 Public Primary Certification Authority - G5
> HEAD /bits.dirkraft.com/favicon.ico HTTP/1.1
> User-Agent: curl/7.37.1
> Host: s3.amazonaws.com
> Accept: */*
>
< HTTP/1.1 200 OK
< x-amz-id-2: WZUhqzQOsfOI0HZ2QUvcg7S4kxBthaAZH6CAdvOL3HIzEsz6VXVvq9b8pHlXIc9g
< x-amz-request-id: 253D39519E8216DC
< Date: Fri, 19 Jun 2015 00:09:14 GMT
< Last-Modified: Sun, 23 Nov 2014 20:43:42 GMT
< ETag: "811119f4bb4ac6e00593c2b6eb92acc6"
< Accept-Ranges: bytes
< Content-Type: image/x-icon
< Content-Length: 318
* Server AmazonS3 is not blacklisted
< Server: AmazonS3
<
* transfer closed with 318 bytes remaining to read
* Closing connection 0
curl: (18) transfer closed with 318 bytes remaining to read

so does Chrome dev tools

Any more pointers?

[lsegal]

It's showing up in the Fiddle now for me.

[dirkraft]

Ah it does now for me too. Fantastic. Thanks very much and keep up the great stuff

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