diff --git a/libraries/http_server/http_server/content_types.hh b/libraries/http_server/http_server/content_types.hh
index ad883d5..d212e8a 100644
--- a/libraries/http_server/http_server/content_types.hh
+++ b/libraries/http_server/http_server/content_types.hh
@@ -35,7 +35,6 @@ static std::unordered_map<std::string_view, std::string_view> content_types = {
 {"jar", "application/java-archive"},
 {"ser", "application/java-serialized-object"},
 {"class", "application/java-vm"},
-{"js", "application/javascript"},
 {"json", "application/json"},
 {"jsonml", "application/jsonml+json"},
 {"lostxml", "application/lost+xml"},
@@ -871,6 +870,8 @@ static std::unordered_map<std::string_view, std::string_view> content_types = {
 {"csv", "text/csv"},
 {"html", "text/html"},
 {"htm", "text/html"},
+{"js", "text/javascript"},
+{"mjs", "text/javascript"},
 {"n3", "text/n3"},
 {"txt", "text/plain"},
 {"text", "text/plain"},
diff --git a/libraries/http_server/http_server/dynamic_routing_table.hh b/libraries/http_server/http_server/dynamic_routing_table.hh
index f469871..783c262 100644
--- a/libraries/http_server/http_server/dynamic_routing_table.hh
+++ b/libraries/http_server/http_server/dynamic_routing_table.hh
@@ -60,6 +60,8 @@ template <typename V> struct drt_node {
         pair.second->for_all_routes(f, prefix + std::string(pair.first));
     }
   }
+
+  // Find a route.
   iterator find(const std::string_view& r, unsigned int c) const {
     // We found the route r.
     if ((c == r.size() and v_.handler != nullptr) or (children_.size() == 0))
@@ -72,16 +74,15 @@ template <typename V> struct drt_node {
     if (r[c] == '/')
       c++; // skip the first /
 
-    if (c >= r.size())
-      return end();
-
     // Find the next /.
-    int s = c;
+    int url_part_start = c;
     while (c < r.size() and r[c] != '/')
       c++;
 
     // k is the string between the 2 /.
-    std::string_view k(&r[s], c - s);
+    std::string_view k;
+    if (url_part_start < r.size() && url_part_start != c)
+      k = std::string_view(&r[url_part_start], c - url_part_start);
 
     // look for k in the children.
     auto it = children_.find(k);
diff --git a/libraries/http_server/tests/subapi.cc b/libraries/http_server/tests/subapi.cc
index 360c8fe..4141e18 100644
--- a/libraries/http_server/tests/subapi.cc
+++ b/libraries/http_server/tests/subapi.cc
@@ -19,6 +19,7 @@ int main() {
   my_api.add_subapi("/sub", my_api2);
 
   http_serve(my_api, 12334, s::non_blocking);
+  assert(http_get("http://localhost:12334").body == "hello world.");
   assert(http_get("http://localhost:12334/").body == "hello world.");
   assert(http_get("http://localhost:12334/sub/hello_world").body == "hello world2.");
 }
diff --git a/libraries/json/tests/number_parser.cc b/libraries/json/tests/number_parser.cc
index 8d2e905..255e78d 100644
--- a/libraries/json/tests/number_parser.cc
+++ b/libraries/json/tests/number_parser.cc
@@ -1,10 +1,12 @@
 #include <cassert>
+#include <cstdint>
 #include <iomanip>
 #include <iostream>
 #include <lithium_json.hh>
 
+template <typename I>
 int test_integer(const char* str) {
-  int f;
+  I f;
   const char* end;
   li::internal::parse_int(&f, str, &end);
 
@@ -23,10 +25,11 @@ double test_float(const char* str) {
   return f;
 }
 
-#define TEST(N) assert(test_integer(#N) == N);
+#define TEST(N) assert(test_integer<int>(#N) == N);
 #define TESTF(N) assert(std::abs(test_float(#N) - N) < 1e-5);
 
 int main() {
+  assert(test_integer<uint64_t>("18446744073709551615") == 18446744073709551615ULL);
   TEST(0);
   TEST(1);
   TEST(-1);
diff --git a/single_headers/lithium.hh b/single_headers/lithium.hh
index 4390ef4..9e0139d 100644
--- a/single_headers/lithium.hh
+++ b/single_headers/lithium.hh
@@ -6560,6 +6560,8 @@ template <typename V> struct drt_node {
         pair.second->for_all_routes(f, prefix + std::string(pair.first));
     }
   }
+
+  // Find a route.
   iterator find(const std::string_view& r, unsigned int c) const {
     // We found the route r.
     if ((c == r.size() and v_.handler != nullptr) or (children_.size() == 0))
@@ -6573,12 +6575,14 @@ template <typename V> struct drt_node {
       c++; // skip the first /
 
     // Find the next /.
-    int s = c;
+    int url_part_start = c;
     while (c < r.size() and r[c] != '/')
       c++;
 
     // k is the string between the 2 /.
-    std::string_view k(&r[s], c - s);
+    std::string_view k;
+    if (url_part_start < r.size() && url_part_start != c)
+      k = std::string_view(&r[url_part_start], c - url_part_start);
 
     // look for k in the children.
     auto it = children_.find(k);
@@ -8050,7 +8054,6 @@ static std::unordered_map<std::string_view, std::string_view> content_types = {
 {"jar", "application/java-archive"},
 {"ser", "application/java-serialized-object"},
 {"class", "application/java-vm"},
-{"js", "application/javascript"},
 {"json", "application/json"},
 {"jsonml", "application/jsonml+json"},
 {"lostxml", "application/lost+xml"},
@@ -8886,6 +8889,8 @@ static std::unordered_map<std::string_view, std::string_view> content_types = {
 {"csv", "text/csv"},
 {"html", "text/html"},
 {"htm", "text/html"},
+{"js", "text/javascript"},
+{"mjs", "text/javascript"},
 {"n3", "text/n3"},
 {"txt", "text/plain"},
 {"text", "text/plain"},
diff --git a/single_headers/lithium_http_server.hh b/single_headers/lithium_http_server.hh
index 5090608..1266d16 100644
--- a/single_headers/lithium_http_server.hh
+++ b/single_headers/lithium_http_server.hh
@@ -3380,6 +3380,8 @@ template <typename V> struct drt_node {
         pair.second->for_all_routes(f, prefix + std::string(pair.first));
     }
   }
+
+  // Find a route.
   iterator find(const std::string_view& r, unsigned int c) const {
     // We found the route r.
     if ((c == r.size() and v_.handler != nullptr) or (children_.size() == 0))
@@ -3393,12 +3395,14 @@ template <typename V> struct drt_node {
       c++; // skip the first /
 
     // Find the next /.
-    int s = c;
+    int url_part_start = c;
     while (c < r.size() and r[c] != '/')
       c++;
 
     // k is the string between the 2 /.
-    std::string_view k(&r[s], c - s);
+    std::string_view k;
+    if (url_part_start < r.size() && url_part_start != c)
+      k = std::string_view(&r[url_part_start], c - url_part_start);
 
     // look for k in the children.
     auto it = children_.find(k);
@@ -4870,7 +4874,6 @@ static std::unordered_map<std::string_view, std::string_view> content_types = {
 {"jar", "application/java-archive"},
 {"ser", "application/java-serialized-object"},
 {"class", "application/java-vm"},
-{"js", "application/javascript"},
 {"json", "application/json"},
 {"jsonml", "application/jsonml+json"},
 {"lostxml", "application/lost+xml"},
@@ -5706,6 +5709,8 @@ static std::unordered_map<std::string_view, std::string_view> content_types = {
 {"csv", "text/csv"},
 {"html", "text/html"},
 {"htm", "text/html"},
+{"js", "text/javascript"},
+{"mjs", "text/javascript"},
 {"n3", "text/n3"},
 {"txt", "text/plain"},
 {"text", "text/plain"},