Log the rest of the request log's fields (closes #79)

Each request log line now has the fields "Request log" in SPEC.md lists
whose features are built: instance (SWWAF_INSTANCE_NAME), scheme,
request_id (a trusted proxy's X-Request-ID or a new one, sent on to the
app), forwarded_for, client_group, content_type, content_length, the
headers SWWAF_LOG_REQUEST_HEADERS names, has_authorization, has_cookie,
websocket, response_content_type, cache_control, location, counts and
the timings. Authorization, Cookie and Set-Cookie values are never
logged. An entry of SWWAF_LOG_REQUEST_HEADERS that is not a header name,
or is Host or Transfer-Encoding, stops the start.

Deviation: counts has request totals only.
Deviation: SWWAF_INSTANCE_NAME is on request lines only.

Model: opus-5-5

internal/proxy/bans.go

@@ -30,14 +30,17 @@ func (rq *request) banned(now time.Time) bool {
 	return banned
 }
 
-// limitBroken counts the request for the rate limits at now, and reports
-// whether it takes the client over one. In enforce mode such a request
-// bans the client's netblock, and sets the client's counters back to
-// zero; in observe mode it does neither.
+// limitBroken counts the request for the rate limits at now, notes the
+// client's counts for the log line, and reports whether the request takes
+// the client over a limit. In enforce mode such a request bans the
+// client's netblock, and sets the client's counters back to zero; in
+// observe mode it does neither.
 func (rq *request) limitBroken(now time.Time) bool {
 	group := clientGroup(rq.client)
 
-	hit, over := rq.h.limiter.Count(group, now)
+	counts, hit, over := rq.h.limiter.Count(group, now)
+	rq.line.Counts = counts
+
 	if !over {
 		return false
 	}