rproxy passes the app the client's AS number and country by default (closes #379)

SWW_WAF_ADD_LOOKUP_HEADERS now defaults to true, so the app gets
X-Client-ASN and X-Client-Country with no setting. While
SWW_WAF_LOOKUP_SOURCE is off it defaults to false, so turning lookups
off alone still starts; true set with the lookup off still stops the
start. With GeoJS, a new client's first request now waits for its
answer, up to SWW_WAF_ASN_AND_COUNTRY_LOOKUP_TIMEOUT_MS.

Model: opus-5-5

docs/settings.md

@@ -150,7 +150,7 @@ cut off; the client is banned.
 - `SWW_WAF_LOOKUP_SOURCE` (default `geojs`): `geojs`, `file` or `off`. `off`
   stops the start while a setting that needs a lookup is set:
     - `SWW_WAF_EXCLUSIVELY_ALLOWED_COUNTRIES`;
-    - `SWW_WAF_ADD_LOOKUP_HEADERS`;
+    - `SWW_WAF_ADD_LOOKUP_HEADERS` set to `true`;
     - `SWW_WAF_TAG_DENY` or `SWW_WAF_TAG_LIMIT_PERCENT` naming a `country=` tag,
       or an `asn=` tag while `SWW_WAF_ROUTEWATCH_URL` is unset;
     - the two byte percentage lists and `SWW_WAF_ASN_LIMIT_PERCENT_URL`;
@@ -161,9 +161,11 @@ cut off; the client is banned.
 - `SWW_WAF_ASN_AND_COUNTRY_LOOKUP_TIMEOUT_MS` (default `800`): how long a
   request waits for its client's first answer from GeoJS, and how long a request
   to GeoJS may take. A time in milliseconds; never `off`.
-- `SWW_WAF_ADD_LOOKUP_HEADERS` (default `false`): `true` has `rproxy` pass the
+- `SWW_WAF_ADD_LOOKUP_HEADERS` (default `true`): `true` has `rproxy` pass the
   app the client's AS number in `X-Client-ASN` and its country in
-  `X-Client-Country`.
+  `X-Client-Country`. The default is `false` while `SWW_WAF_LOOKUP_SOURCE` is
+  `off`. With GeoJS, a new client's first request waits for its answer, up to
+  `SWW_WAF_ASN_AND_COUNTRY_LOOKUP_TIMEOUT_MS`.
 
 ## Country list