Added access log to server and modified mock-fts to use it

internal/config/README.md

@@ -101,6 +101,7 @@ The `server` section is split into a number of sub-sections:
 | `server.port` | int | `9393` | Port to listen on; `0`: any free port |
 | `server.max_header_bytes` | byte size | `8KB` | Largest request header block; `0B` for 8KB. `-1` (no limit) is rejected, as the HTTP server always has one |
 | `server.max_body_bytes` | byte size | `1MB` | Largest request body; `0B` for 1MB, `-1` for no limit |
+| `server.access_log` | string | | File the access log is appended to, one line per request in the Combined Log Format; `-`: stdout; empty: no access log. `serve --access-log` overrides it |
 
 #### Timeouts
 

internal/config/conf_server.go

@@ -15,11 +15,15 @@ const JSCKServer string = "server"
 // port). MaxHeaderBytes is the largest request header block; 0 means the
 // default (8KB), and -1 (no limit) is rejected (see validate). MaxBodyBytes is
 // the largest request body; 0 means the default (1MB) and -1 no limit.
+// AccessLog is the file the access log is appended to, one line per request
+// in the Combined Log Format; "-" means stdout, and empty means no access
+// log.
 type JSCServer struct {
 	Host           string              `cfg:"host"             default:"127.0.0.1"`
 	Port           int                 `cfg:"port"             default:"9393"`
 	MaxHeaderBytes util.ByteSize       `cfg:"max_header_bytes" default:"8KB"`
 	MaxBodyBytes   util.ByteSize       `cfg:"max_body_bytes"   default:"1MB"`
+	AccessLog      string              `cfg:"access_log"`
 	Timeouts       JSCServerTimeouts   `cfg:"timeouts"`
 	RateLimits     JSCServerRateLimits `cfg:"rate_limits"`
 	Proxy          JSCServerProxy      `cfg:"proxy"`