diff --git a/Makefile b/Makefile
index 5cf73209..bc880df2 100644
--- a/Makefile
+++ b/Makefile
@@ -37,6 +37,14 @@ test/packed_fs.c:
 	$(CC) $(CFLAGS) test/pack.c -o pack
 	./pack Makefile src/ssi.h test/fuzz.c test/data/a.txt -z 'gzip -c' test/data/range.txt > $@
 
+DIR ?= test/data/
+OUT ?= gui.c
+ZIP ?= -z 'gzip -c'
+mkfs:
+	$(CC) $(CFLAGS) test/pack.c -o pack
+	./pack $(ZIP) -s $(DIR) `find $(DIR) -type f` > $(OUT)
+#	find $(DIR) -type f | sed -e s,^$(DIR),,g -e s,^/,,g
+
 # Check that all external (exported) symbols have "mg_" prefix
 mg_prefix: mongoose.c mongoose.h
 	$(CC) mongoose.c $(CFLAGS) -c -o /tmp/x.o && nm /tmp/x.o | grep ' T' | grep -v 'mg_' ; test $$? = 1
@@ -62,7 +70,7 @@ fuzz: fuzzer
 # make CC=/usr/local/opt/llvm\@8/bin/clang ASAN_OPTIONS=detect_leaks=1
 test: mongoose.h  Makefile $(SRCS)
 	$(CC) $(SRCS) $(CFLAGS) -coverage $(LDFLAGS) -g -o unit_test
-	ASAN_OPTIONS=$(ASAN_OPTIONS) $(RUN) ./unit_test
+	ASAN1OPTIONS=$(ASAN_OPTIONS) $(RUN) ./unit_test
 
 coverage: test
 	gcov -l -n *.gcno | sed '/^$$/d' | sed 'N;s/\n/ /'
diff --git a/mongoose.c b/mongoose.c
index 31a40dfd..dfc735cb 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -645,8 +645,9 @@ const char *mg_unlist(size_t no) {
 #endif
 
 static int is_dir_prefix(const char *prefix, size_t n, const char *path) {
-  return n < strlen(path) && memcmp(prefix, path, n) == 0 && path[n] == '/';
-  //(n == 0 || path[n] == MG_DIRSEP);
+  // MG_INFO(("[%.*s] [%s] %c", (int) n, prefix, path, path[n]));
+  return n < strlen(path) && strncmp(prefix, path, n) == 0 &&
+         (n == 0 || path[n] == '/' || path[n - 1] == '/');
 }
 
 static int packed_stat(const char *path, size_t *size, time_t *mtime) {
@@ -1377,7 +1378,7 @@ static void static_cb(struct mg_connection *c, int ev, void *ev_data,
     // Read to send IO buffer directly, avoid extra on-stack buffer
     size_t n, max = 2 * MG_IO_SIZE;
     if (c->send.size < max) mg_iobuf_resize(&c->send, max);
-    if (c->send.len > 0) return;  // Wait until drained: for some LWIP setups
+    if (c->send.len >= c->send.size) return;  // Rate limit
     n = fd->fs->rd(fd->fd, c->send.buf + c->send.len,
                    c->send.size - c->send.len);
     c->send.len += n;
diff --git a/src/fs_packed.c b/src/fs_packed.c
index 9965b54a..a7acaadd 100644
--- a/src/fs_packed.c
+++ b/src/fs_packed.c
@@ -22,8 +22,9 @@ const char *mg_unlist(size_t no) {
 #endif
 
 static int is_dir_prefix(const char *prefix, size_t n, const char *path) {
-  return n < strlen(path) && memcmp(prefix, path, n) == 0 && path[n] == '/';
-  //(n == 0 || path[n] == MG_DIRSEP);
+  // MG_INFO(("[%.*s] [%s] %c", (int) n, prefix, path, path[n]));
+  return n < strlen(path) && strncmp(prefix, path, n) == 0 &&
+         (n == 0 || path[n] == '/' || path[n - 1] == '/');
 }
 
 static int packed_stat(const char *path, size_t *size, time_t *mtime) {
diff --git a/src/http.c b/src/http.c
index 724ec772..56af818c 100644
--- a/src/http.c
+++ b/src/http.c
@@ -383,7 +383,7 @@ static void static_cb(struct mg_connection *c, int ev, void *ev_data,
     // Read to send IO buffer directly, avoid extra on-stack buffer
     size_t n, max = 2 * MG_IO_SIZE;
     if (c->send.size < max) mg_iobuf_resize(&c->send, max);
-    if (c->send.len > 0) return;  // Wait until drained: for some LWIP setups
+    if (c->send.len >= c->send.size) return;  // Rate limit
     n = fd->fs->rd(fd->fd, c->send.buf + c->send.len,
                    c->send.size - c->send.len);
     c->send.len += n;
diff --git a/test/pack.c b/test/pack.c
index d48d28e3..8cbce213 100644
--- a/test/pack.c
+++ b/test/pack.c
@@ -28,7 +28,6 @@ static const char *code =
     "const char *mg_unlist(size_t no) {\n"
     "  return packed_files[no].name;\n"
     "}\n"
-    "const char *mg_unpack(const char *name, size_t *size, time_t *mtime);\n"
     "const char *mg_unpack(const char *name, size_t *size, time_t *mtime) {\n"
     "  const struct packed_file *p;\n"
     "  for (p = packed_files; p->name != NULL; p++) {\n"
@@ -42,7 +41,7 @@ static const char *code =
 
 int main(int argc, char *argv[]) {
   int i, j, ch;
-  const char *zip_cmd = NULL;
+  const char *zip_cmd = NULL, *strip_prefix = "";
 
   printf("%s", "#include <stddef.h>\n");
   printf("%s", "#include <string.h>\n");
@@ -52,6 +51,12 @@ int main(int argc, char *argv[]) {
   for (i = 1; i < argc; i++) {
     if (strcmp(argv[i], "-z") == 0 && i + 1 < argc) {
       zip_cmd = argv[++i];
+    } else if (strcmp(argv[i], "-s") == 0) {
+      strip_prefix = argv[++i];
+    } else if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
+      fprintf(stderr, "Usage: %s [-z ZIP_CMD] [-s STRIP_PREFIX] files...\n",
+              argv[0]);
+      exit(EXIT_FAILURE);
     } else {
       char ascii[12], cmd[2048];
       FILE *fp;
@@ -96,10 +101,16 @@ int main(int argc, char *argv[]) {
 
   for (i = 1; i < argc; i++) {
     struct stat st;
-    if (strcmp(argv[i], "-z") == 0 && ++i + 1 < argc) continue;
+    const char *name = argv[i];
+    size_t n = strlen(strip_prefix);
+    if (strcmp(argv[i], "-z") == 0 || strcmp(argv[i], "-s") == 0) {
+      i++;
+      continue;
+    }
     stat(argv[i], &st);
-    printf("  {\"/%s\", v%d, sizeof(v%d), %lu, %d},\n", argv[i], i, i,
-           st.st_mtime, zip_cmd == NULL ? 0 : 1);
+    if (strncmp(name, strip_prefix, n) == 0) name += n;
+    printf("  {\"/%s\", v%d, sizeof(v%d), %lu, %d},\n", name, i, i, st.st_mtime,
+           zip_cmd == NULL ? 0 : 1);
   }
   printf("%s", "  {NULL, NULL, 0, 0, 0}\n");
   printf("%s", "};\n\n");
diff --git a/test/unit_test.c b/test/unit_test.c
index 400458e5..573dc841 100644
--- a/test/unit_test.c
+++ b/test/unit_test.c
@@ -1559,7 +1559,7 @@ static void eh7(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
     struct mg_http_message *hm = (struct mg_http_message *) ev_data;
     struct mg_http_serve_opts sopts;
     memset(&sopts, 0, sizeof(sopts));
-    sopts.root_dir = "";
+    sopts.root_dir = "/";
     sopts.fs = &mg_fs_packed;
     mg_http_serve_dir(c, hm, &sopts);
   }