From 61893a00a42d0f5ac00c9422d63bd82ccdc56531 Mon Sep 17 00:00:00 2001
From: yhirose <yuji.hirose.bug@gmail.com>
Date: Sat, 3 May 2025 22:50:47 +0900
Subject: [PATCH] Fix #2135

---
 httplib.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/httplib.h b/httplib.h
index 0aa4e62..766819d 100644
--- a/httplib.h
+++ b/httplib.h
@@ -2066,7 +2066,9 @@ template <size_t N> inline constexpr size_t str_len(const char (&)[N]) {
 }
 
 inline bool is_numeric(const std::string &str) {
-  return !str.empty() && std::all_of(str.begin(), str.end(), ::isdigit);
+  return !str.empty() &&
+         std::all_of(str.cbegin(), str.cend(),
+                     [](unsigned char c) { return std::isdigit(c); });
 }
 
 inline uint64_t get_header_value_u64(const Headers &headers,