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# Debug Pings
For debugging and testing purposes Glean allows to tag pings, which are then available in the [Debug Ping Viewer][debug-ping-viewer][^1].
Pings are sent to the same endpoint as all pings, with the addition of one HTTP header:
```
X-Debug-ID: <tag>
```
`<tag>` is a alphanumeric string with a maximum length of 20 characters, used to identify pings in the Debug Ping Viewer.
See [Debugging products using the Glean SDK](../../../book/user/debugging/index.md) for detailed information how to use this mechanism in applications.
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[^1]: Requires a Mozilla login.