Add JSON support for X-Authenticated-User. Supported as a custom field.

src/output-json-http.c

@@ -91,6 +91,7 @@ typedef enum {
     HTTP_FIELD_X_REQUESTED_WITH,
     HTTP_FIELD_DNT,
     HTTP_FIELD_X_FORWARDED_PROTO,
+    HTTP_FIELD_X_AUTHENTICATED_USER,
     HTTP_FIELD_ACCEPT_RANGES,
     HTTP_FIELD_AGE,
     HTTP_FIELD_ALLOW,
@@ -146,6 +147,7 @@ struct {
     { "x_requested_with", "x-requested-with", LOG_HTTP_REQUEST },
     { "dnt", "dnt", LOG_HTTP_REQUEST },
     { "x_forwarded_proto", "x-forwarded-proto", LOG_HTTP_REQUEST },
+    { "x_authenticated_user", "x-authenticated-user", LOG_HTTP_REQUEST },
     { "accept_range", "accept-range", 0 },
     { "age", "age", 0 },
     { "allow", "allow", 0 },