Headers Inspector
The /headers endpoint returns the HTTP headers sent by the client. It is useful for debugging proxies, CORS configurations, and request pipelines. Sensitive headers are automatically redacted.
GET/v6/headers
Use Cases
Inspect what headers your client sends to the server, debug reverse proxy configurations, verify CORS headers, or check if authentication headers are being forwarded correctly.
Parameters
| Parameter | Required | Description |
|---|---|---|
filter | No | Comma-separated list of header names to return. Returns all headers if omitted. |
Redacted Headers
The following headers are always returned as [redacted] to prevent sensitive data exposure:
| Header |
|---|
authorization |
cookie |
set-cookie |
proxy-authorization |
Response Fields
| Field | Type | Description |
|---|---|---|
count | number | Number of headers returned |
headers | object | Key-value map of request headers (sensitive ones redacted) |
ip | string | Client IP address |
method | string | HTTP method of the request |
url | string | Full request URL |
Code Examples
curl -X GET \
"https://api.sylvain.sh/v6/headers"Try It
Note
This endpoint does not throw errors for invalid filter names — unknown names simply return no matching headers.