HTTP Header Parser
Paste response or request headers copied from developer tools or a command line. They are split up, and the common ones are explained line by line.
Worked examples
A cache header
Cache-Control: public, max-age=86400
Cache-Control: public, max-age=86400 public max-age: 86400 (1 day)
The time is also shown in days.
The same as JSON
Content-Type: text/html X-Frame-Options: DENY
{ "Content-Type": "text/html", "X-Frame-Options": "DENY" }
Every header becomes a key in one object.
About HTTP Header Parser
This parser makes raw HTTP headers readable. Paste the headers from a response or a request and each line is split into a name and a value, with the common headers explained part by part.
Content-Type is split into its type and charset, Cache-Control into its directives with times in days, hours or minutes, Set-Cookie into the cookie and its attributes, and Strict-Transport-Security into its directives. Switch to JSON to get every header in one object.
How to use HTTP Header Parser
- Copy the headers from your developer tools or a command line and paste them in.
- Choose a readable breakdown or JSON.
- Copy the result, or fix any line the tool points out.
Common uses
- Reading cache settings from a response
- Checking what a cookie sets
- Turning headers from a bug report into JSON
- Learning what each directive in a header means
Frequently asked questions
Can I paste a status line too?
Yes. A line such as HTTP/1.1 200 OK at the top is kept and shown as the status.
What if a header appears more than once?
Each one is shown on its own in the breakdown. In JSON, a repeated header becomes a list.
Why are times shown in days or hours?
Values such as max-age are in seconds. The tool also shows the plain length of time, such as 86400 seconds as 1 day.
What causes an error?
A line that is not blank, not a continuation of the line before and has no colon. The message shows the start of the line.