Fix #1973

httplib.h

@@ -2910,8 +2910,14 @@ inline bool mmap::open(const char *path) {
 
 #if defined(_WIN32)
   std::wstring wpath;
-  for (size_t i = 0; i < strlen(path); i++) {
-    wpath += path[i];
+  {
+    auto len = static_cast<int>(strlen(path));
+    auto wlen = ::MultiByteToWideChar(CP_UTF8, 0, path, len, nullptr, 0);
+    if (!wlen) { return false; }
+    wpath.resize(wlen);
+    wlen = ::MultiByteToWideChar(CP_UTF8, 0, path, len,
+                                 reinterpret_cast<LPWSTR>(wpath.data()), wlen);
+    if (wlen != wpath.size()) { return false; }
   }
 
 #if _WIN32_WINNT >= _WIN32_WINNT_WIN8
@@ -7679,6 +7685,19 @@ inline bool ClientImpl::write_request(Stream &strm, Request &req,
 
   if (!req.has_header("Accept")) { req.set_header("Accept", "*/*"); }
 
+  // TODO: #1975: 'Accept-Encoding'
+  if (!req.has_header("Accept-Encoding")) {
+    std::string accept_encoding;
+#ifdef CPPHTTPLIB_BROTLI_SUPPORT
+    accept_encoding = "br";
+#endif
+#ifdef CPPHTTPLIB_ZLIB_SUPPORT
+    if (!accept_encoding.empty()) { accept_encoding += ", "; }
+    accept_encoding += "gzip, deflate";
+#endif
+    req.set_header("Accept-Encoding", accept_encoding);
+  }
+
 #ifndef CPPHTTPLIB_NO_DEFAULT_USER_AGENT
   if (!req.has_header("User-Agent")) {
     auto agent = std::string("cpp-httplib/") + CPPHTTPLIB_VERSION;