Standard debug headers

EdgeWorkers supports request-level debugging via the Pragma request header.

If a request passes a Pragma request header containing EdgeWorkers specific values, the related trace response headers are returned. These response headers contain information about the EdgeWorker executed during the request or response.

Tip: See Enable enhanced debug headers for instructions on how to return more detailed response headers that include a status message and the amount of initialization wall time, wall time, initialization CPU time, CPU time, and memory usage consumed by the event handler. Enhanced debug headers can also provide information about HTTP sub-requests.

The Pragma value can be one or more of the following:

Akamai Pragma Header Returns debug information from
akamai-x-ew-debug the onClientRequest, onClientResponse, onOriginRequest, and onOriginResponse event handlers
akamai-x-ew-debug-rp the ResponseProvider event handler
akamai-x-ew-debug-subs all event handlers when an HTTP sub-request is made
akamai-x-ew-onclientrequest only the onClientRequest event handler
akamai-x-ew-onoriginrequest only the onOriginRequest event handler
akamai-x-ew-onoriginresponse only the onOriginResponse event handler
akamai-x-ew-onclientresponse only the onClientResponse event handler
Here's a curl request that passes the Pragma akamai-x-ew-debug request header:
curl "" -H "Pragma: akamai-x-ew-debug" -sD -
This example shows the trace response headers with successful execution of all event handlers:
HTTP/1.1 200
Content-Type: text/html
Content-Length: 1024
Date: Tue, 17 Sep 2020 02:31:17 GMT
Connection: keep-alive
X-Akamai-EdgeWorker-onClientResponse-Info: ew=9 v7.0:EW for; status=Success
X-Akamai-EdgeWorker-onClientRequest-Info: ew=9 v7.0: EW for; status=Success
X-Akamai-EdgeWorker-onOriginResponse-Info: ew=9 v7.0:EW for; status=Success
X-Akamai-EdgeWorker-onOriginRequest-Info: ew=9 v7.0: EW for; status=Success
X-Akamai-EdgeWorker-ResponseProvider-Info: ew=9 v7.0: EW for; status=Success
X-Powered-By: Akamai EdgeWorkers
Here's a curl request that passes the Pragma akamai-x-ew-onclientrequest response header:
curl "" -H "Pragma: akamai-x-ew-onclientrequest" -sD -
This example shows the trace response header with an error response:
HTTP/1.1 500 Internal Server Error
Server: AkamaiGHost
Mime-Version: 1.0
Content-Type: text/html
Content-Length: 174
Expires: Thu, 12 Sep 2019 15:11:24 GMT
Date: Thu, 12 Sep 2019 15:11:24 GMT
Connection: close
X-Akamai-EdgeWorker-onClientRequest-Info: ew=9 v7.0:EW for; status=Failed
The Standard debug header currently contains EdgeWorker details and the status type.
Note: The trace response header format may change in the future to include new fields.
Response Header fields Details Description
EdgeWorker details

ew=<id> v<version>:<name>
<id> EdgeWorker ID
<version> EdgeWorker version number
<name> EdgeWorker name
Status type

status=<status type>
<status type> Possible values include:
  • Success - the EdgeWorker successfully executed.
  • UnimplementedHandler - the requested event handler wasn't implemented by the EdgeWorker.
  • Failed - the EdgeWorker did not successfully execute.