XAP | Flexible-Origin Help Page

This document shows all the x-fo headers available to control the Flexible Origin, you might want to combine them to achieve a specific response, be careful not to step over your own foot (like invoking two actions that modify the body of the response). The user guide is divided into the following sections:

• X-FO Response Code: explain all the X-FO headers that act over the response status code.
• X-FO Responde Body: explain all the X-FO headers that act over the response body.
• X-FO Response Headers: explain all the X-FO headers that act over the response headers.
• X-FO Action Headers: explain all those actions that don't have to do with response code, body, or headers (eg. Add a delay on the response coming from the origin).
• Flexible Origin APIs: explain all the APIs available to control other Flexible Origin characteristics (like uploading files, etc.).
• Other useful information: explain other useful tips you might want to know about Flexible Origin.

We are working on a special Jira space to report bugs or ask for enhancements for any XAP project. In the meantime please send your notes to [email protected] and we will take care.

X-Akamai-Projects (XAP) is a Service Delivery initiative that groups SAs that want to innovate and work on side projects with global impact. XAP is not about individuals is about community. Flexible Origin is one product of this effort. More information here.

Goal	Define the response status code
Header name	x-fo-statuscode-define
Value syntax	{ 0,999 }
Example	x-fo-statuscode-define: 200

Goal	Show the request headers received by the origin
Header name	x-fo-body-showrequestheaders
Value syntax	{ json | plain | html | xml }
Example	x-fo-body-showrequestheaders: json

Goal	Show the request body received by the origin
Header name	x-fo-body-showrequestbody
Value syntax	{ plain }
Example	x-fo-body-showrequestbody: plain

Goal	Send relevant information through the response body (request headers received by the origin, origin IP, origin hostname, request method, URL)
Header name	x-fo-body-info
Value syntax	{ json | plain | html | xml | help }
Example	x-fo-body-info: json

Goal	Return a compressed object in the required format
Header name	x-fo-body-compressed
Value syntax	{ zip | gzip | bzip | deflate | br }
Example	x-fo-body-compressed: gzip

Goal	Return an image in the selected format
Header name	x-fo-body-image
Value syntax	{ png | gif | jpeg }
Example	x-fo-body-image: png

Goal	Return a binary random object with the selected size in bytes
Header name	x-fo-body-binary
Value syntax	{ Number_of_bytes }
Example	x-fo-body-binary: 20

Goal	Return a text based object of the desired format
Header name	x-fo-body-text
Value syntax	{ css | html | js | plain | indexhtml }
Example	x-fo-body-text: css

Goal	Return selected amount of log lines (the tail of the log file). You can use these log lines to check headers received by the flexible origin and some other information (let us know if you want to see any special information in the logs)
Header name	x-fo-body-loglines
Value syntax	{ Number_of_log_lines }
Example	x-fo-body-loglines: 10

Goal	Add a header in the response from origin. You must define a different number for each header you are trying to set
Header name	x-fo-header-add-{number}
Value syntax	{ header_name=header_value }
Example	x-fo-header-add-1: Cache-Control=max-age=0s

Goal	Add cookie in the response from origin. You must define a different number for each cookie you are trying to set
Header name	x-fo-header-addcookie-{number}
Value syntax	{ cookie }
Example	x-fo-header-addcookie-1: thisIsAcookie=IamACookie

Goal	Modify a reponse header coming from the origin. You must define a different number for each header you are trying to modify. The 'Server' header can't be modified by the moment. Let us know if this is something you need
Header name	x-fo-header-modify-{number}
Value syntax	{ header_name=header_new_value }
Example	x-fo-header-modify-1: Content-Length=1000

Goal	Make the Flexible Origin delay its response by the amount of seconds you need
Header name	x-fo-action-delay
Value syntax	{ time_in_seconds }
Example	x-fo-action-delay: 15

Allowed methods

Flexible Origin allows the following methods: GET, POST, PUT, DELETE, OPTIONS, and HEAD

Reserved paths

Flexible Origin reserves the following paths for internal processing: /static/* and /x-fo/*.

Combined headers

All x-fo headers only work over a specific section of the response or over a specific action. This means you might need to combine more than one x-fo header to achieve a goal. For example, if you want to get an image that is displayed in your browser you might want to combine x-fo-body-image and also x-fo-header-add to include 'Content-Type: image/png'. This gives you A LOT of flexibility (that's why it's called Flexible Origin, duh!)