Dump HTTP headers via cURL

cURL is one of the HTTP related tools on the command line. It serves quite well for quick checks, for automation and it can be used as a library as well.

The following example commands are useful to quickly dump the headers of an HTTP response on the command line:

curl -s -D - -o /dev/null https://www.johbo.com/

This should show output like the following:

HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 20857
Connection: keep-alive
Date: Wed, 09 Nov 2016 13:08:24 GMT
x-amz-meta-s3cmd-attrs: uid:501/gname:staff/uname:johannes/gid:20/mode:33188/mtime:1478692988/atime:1478692988/md5:2e65ca3825b7a8f1a84e6dde88af8045/ctime:1478692988
Last-Modified: Wed, 09 Nov 2016 12:03:13 GMT
ETag: "2e65ca3825b7a8f1a84e6dde88af8045"
Server: AmazonS3
Age: 37
X-Cache: Hit from cloudfront
Via: 1.1 f989b812753677758cd8909391e239ac.cloudfront.net (CloudFront)
X-Amz-Cf-Id: 0hWe7fidk775BGN7Wu84Q3Mu6W3u3x-fQBHz6xMgO25OrU6_8cEITw==