X-Git-Url: http://dolda2000.com/gitweb/?p=statserve.git;a=blobdiff_plain;f=statserve.c;fp=statserve.c;h=1801b95b3e632392870b4fb5a779971a02f1febf;hp=9bee73b2c7dd62a86f35d497cfbfa09e453464f2;hb=86d0fd88c918f7cded4c864f646b6ff34c7bab9c;hpb=a823d5b4a231f42a598ac3624f9271a2a3b29a50

diff --git a/statserve.c b/statserve.c
index 9bee73b..1801b95 100644
--- a/statserve.c
+++ b/statserve.c
@@ -23,6 +23,18 @@ static struct source *parsesource(char *arg)
     }
 }
 
+static int cached(struct hthead *req, struct fileinfo f)
+{
+    char *hdr;
+    time_t cdate;
+    
+    if((hdr = getheader(req, "If-Modified-Since")) != NULL) {
+	cdate = parsehttpdate(hdr);
+	return((cdate > 0) && !(cdate < f.mtime));
+    }
+    return(0);
+}
+
 static void serve(struct muth *muth, va_list args)
 {
     vavar(struct hthead *, req);
@@ -42,12 +54,18 @@ static void serve(struct muth *muth, va_list args)
 	goto out;
     }
     out = mtstdopen(fd, 1, 60, "r+");
-    fprintf(out, "HTTP/1.1 200 OK\n");
-    fprintf(out, "Content-Type: %s\n", f.ctype);
-    fprintf(out, "Content-Length: %zi\n", f.sz);
-    fprintf(out, "Last-Modified: %s\n", fmthttpdate(f.mtime));
-    fprintf(out, "\n");
-    fwrite(f.data, 1, f.sz, out);
+    if(cached(req, f)) {
+	fprintf(out, "HTTP/1.1 304 Not Modified\n");
+	fprintf(out, "Content-Length: 0\n");
+	fprintf(out, "\n");
+    } else {
+	fprintf(out, "HTTP/1.1 200 OK\n");
+	fprintf(out, "Content-Type: %s\n", f.ctype);
+	fprintf(out, "Content-Length: %zi\n", f.sz);
+	fprintf(out, "Last-Modified: %s\n", fmthttpdate(f.mtime));
+	fprintf(out, "\n");
+	fwrite(f.data, 1, f.sz, out);
+    }
     free(f.data);
     
 out: