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Age

how many seconds response has been cached
Age: 355

Date

when response was sent
Date: Mon, 09 Sep 2019...

Last-Modified

when content was last modified (not always accurate)

ETag

Version of response body
Etag: "ac5affa.."

Cache-Control

various caching
settings Cache-Control: max-age=300

Vary

request headers that response will vary based on

Via

added by proxy servers
Via: nginx

Expires

The response is stale and should be re-requested after this time.

Connection

“close” or “keep-alive” Whether to keep the TCP connection open

Sets a cookie.
Set-Cookie: name=value; HttpOnly

Access-Control-*

Called CORS headers. These allow cross-origin requests.

Content-Type

MIME type of body
Content-Type: text/plain

Content-Length

length of body in bytes
Content-Length: 33

Content-Language

Language of body
Content-Language: en-US

Content-Encoding

Whether body is compressed
Content-Encoding: gzip

Location

URL to redirect to
Location: /cat.png

Accept-Ranges

Whether Range request header is supported for this resource

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