Updated README

Remove use of exceptions.

README.md

@@ -121,14 +121,14 @@ svr.Post("/content_receiver",
     if (req.is_multipart_form_data()) {
       MultipartFiles files;
       content_reader(
+        [&](const std::string &name, const MultipartFile &file) {
+          files.emplace(name, file);
+          return true;
+        },
         [&](const std::string &name, const char *data, size_t data_length) {
           auto &file = files.find(name)->second;
           file.content.append(data, data_length);
           return true;
-        },
-        [&](const std::string &name, const MultipartFile &file) {
-          files.emplace(name, file);
-          return true;
         });
     } else {
       std::string body;
@@ -156,7 +156,7 @@ svr.Get("/chunked", [&](const Request& req, Response& res) {
 });
 ```
 
-### Default thread pool supporet
+### Default thread pool support
 
 Set thread count to 8:
 
@@ -324,16 +324,23 @@ std::shared_ptr<httplib::Response> res =
 
 This feature was contributed by [underscorediscovery](https://github.com/yhirose/cpp-httplib/pull/23).
 
-### Basic Authentication
+### Authentication
+
+NOTE: OpenSSL is required for Digest Authentication, since cpp-httplib uses message digest functions in OpenSSL.
 
 ```cpp
 httplib::Client cli("httplib.org");
+cli.set_auth("user", "pass");
 
-auto res = cli.Get("/basic-auth/hello/world", {
+// Basic
-  httplib::make_basic_authentication_header("hello", "world")
+auto res = cli.Get("/basic-auth/user/pass");
-});
 // res->status should be 200
-// res->body should be "{\n  \"authenticated\": true, \n  \"user\": \"hello\"\n}\n".
+// res->body should be "{\n  \"authenticated\": true, \n  \"user\": \"user\"\n}\n".
+
+// Digest
+res = cli.Get("/digest-auth/auth/user/pass/SHA-256");
+// res->status should be 200
+// res->body should be "{\n  \"authenticated\": true, \n  \"user\": \"user\"\n}\n".
 ```
 
 ### Range

example/Makefile

@@ -33,4 +33,4 @@ pem:
 	openssl req -new -key key.pem | openssl x509 -days 3650 -req -signkey key.pem > cert.pem
 
 clean:
-	rm server client hello simplesvr upload redirect *.pem
+	rm server client hello simplesvr upload redirect benchmark *.pem

example/simplesvr.cc

@@ -46,10 +46,7 @@ string dump_multipart_files(const MultipartFiles &files) {
     snprintf(buf, sizeof(buf), "content type: %s\n", file.content_type.c_str());
     s += buf;
 
-    snprintf(buf, sizeof(buf), "text offset: %lu\n", file.offset);
+    snprintf(buf, sizeof(buf), "text length: %lu\n", file.content.size());
-    s += buf;
-
-    snprintf(buf, sizeof(buf), "text length: %lu\n", file.length);
     s += buf;
 
     s += "----------------\n";

example/upload.cc

@@ -37,10 +37,10 @@ int main(void) {
 
   svr.Post("/post", [](const Request & req, Response &res) {
     auto file = req.get_file_value("file");
-    cout << "file: " << file.offset << ":" << file.length << ":" << file.filename << endl;
+    cout << "file length: " << file.content.length() << ":" << file.filename << endl;
 
     ofstream ofs(file.filename, ios::binary);
-    ofs << req.body.substr(file.offset, file.length);
+    ofs << file.content;
 
     res.set_content("done", "text/plain");
   });

httplib.h

@@ -149,9 +149,13 @@ using socket_t = int;
 
 #ifdef CPPHTTPLIB_OPENSSL_SUPPORT
 #include <openssl/err.h>
+#include <openssl/md5.h>
 #include <openssl/ssl.h>
 #include <openssl/x509v3.h>
 
+#include <iomanip>
+#include <sstream>
+
 // #if OPENSSL_VERSION_NUMBER < 0x1010100fL
 // #error Sorry, OpenSSL versions prior to 1.1.1 are not supported
 // #endif
@@ -225,22 +229,22 @@ using MultipartFormDataItems = std::vector<MultipartFormData>;
 using ContentReceiver =
     std::function<bool(const char *data, size_t data_length)>;
 
-using MultipartContentReceiver =
-    std::function<bool(const std::string& name, const char *data, size_t data_length)>;
-
 using MultipartContentHeader =
     std::function<bool(const std::string &name, const MultipartFile &file)>;
 
+using MultipartContentReceiver =
+    std::function<bool(const std::string& name, const char *data, size_t data_length)>;
+
 class ContentReader {
   public:
     using Reader = std::function<bool(ContentReceiver receiver)>;
-    using MultipartReader = std::function<bool(MultipartContentReceiver receiver, MultipartContentHeader header)>;
+    using MultipartReader = std::function<bool(MultipartContentHeader header, MultipartContentReceiver receiver)>;
 
     ContentReader(Reader reader, MultipartReader muitlpart_reader)
       : reader_(reader), muitlpart_reader_(muitlpart_reader) {}
 
-    bool operator()(MultipartContentReceiver receiver, MultipartContentHeader header) const {
+    bool operator()(MultipartContentHeader header, MultipartContentReceiver receiver) const {
-      return muitlpart_reader_(receiver, header);
+      return muitlpart_reader_(header, receiver);
     }
 
     bool operator()(ContentReceiver receiver) const {
@@ -591,13 +595,13 @@ private:
   bool read_content_with_content_receiver(Stream &strm, bool last_connection,
                                           Request &req, Response &res,
                                           ContentReceiver receiver,
-                                          MultipartContentReceiver multipart_receiver,
+                                          MultipartContentHeader multipart_header,
-                                          MultipartContentHeader multipart_header);
+                                          MultipartContentReceiver multipart_receiver);
   bool read_content_core(Stream &strm, bool last_connection,
                          Request &req, Response &res,
                          ContentReceiver receiver,
-                         MultipartContentReceiver multipart_receiver,
+                         MultipartContentHeader mulitpart_header,
-                         MultipartContentHeader mulitpart_header);
+                         MultipartContentReceiver multipart_receiver);
 
   virtual bool process_and_close_socket(socket_t sock);
 
@@ -756,10 +760,13 @@ public:
             std::vector<Response> &responses);
 
   void set_keep_alive_max_count(size_t count);
+
   void set_read_timeout(time_t sec, time_t usec);
 
   void follow_location(bool on);
 
+  void set_auth(const char *username, const char *password);
+
 protected:
   bool process_request(Stream &strm, const Request &req, Response &res,
                        bool last_connection, bool &connection_close);
@@ -772,6 +779,8 @@ protected:
   time_t read_timeout_sec_;
   time_t read_timeout_usec_;
   size_t follow_location_;
+  std::string username_;
+  std::string password_;
 
 private:
   socket_t create_client_socket() const;
@@ -1114,6 +1123,11 @@ public:
     }
   }
 
+  bool end_with_crlf() const {
+    auto end = ptr() + size();
+    return size() >= 2 && end[-2] == '\r' && end[-1] == '\n';
+  }
+
   bool getline() {
     fixed_buffer_used_size_ = 0;
     glowable_buffer_.clear();
@@ -1357,6 +1371,26 @@ inline bool is_connection_error() {
 #endif
 }
 
+inline socket_t create_client_socket(
+    const char *host, int port, time_t timeout_sec) {
+  return create_socket(
+      host, port, [=](socket_t sock, struct addrinfo &ai) -> bool {
+        set_nonblocking(sock, true);
+
+        auto ret = ::connect(sock, ai.ai_addr, static_cast<int>(ai.ai_addrlen));
+        if (ret < 0) {
+          if (is_connection_error() ||
+              !wait_until_socket_is_ready(sock, timeout_sec, 0)) {
+            close_socket(sock);
+            return false;
+          }
+        }
+
+        set_nonblocking(sock, false);
+        return true;
+      });
+}
+
 inline std::string get_remote_addr(socket_t sock) {
   struct sockaddr_storage addr;
   socklen_t len = sizeof(addr);
@@ -1414,6 +1448,7 @@ inline const char *status_message(int status) {
   case 303: return "See Other";
   case 304: return "Not Modified";
   case 400: return "Bad Request";
+  case 401: return "Unauthorized";
   case 403: return "Forbidden";
   case 404: return "Not Found";
   case 413: return "Payload Too Large";
@@ -1542,18 +1577,35 @@ inline uint64_t get_header_value_uint64(const Headers &headers, const char *key,
 }
 
 inline bool read_headers(Stream &strm, Headers &headers) {
-  static std::regex re(R"((.+?):\s*(.+?)\s*\r\n)");
-
   const auto bufsiz = 2048;
   char buf[bufsiz];
-
   stream_line_reader line_reader(strm, buf, bufsiz);
 
   for (;;) {
     if (!line_reader.getline()) { return false; }
-    if (!strcmp(line_reader.ptr(), "\r\n")) { break; }
+
+    // Check if the line ends with CRLF.
+    if (line_reader.end_with_crlf()) {
+      // Blank line indicates end of headers.
+      if (line_reader.size() == 2) { break; }
+    } else {
+      continue; // Skip invalid line.
+    }
+
+    // Skip trailing spaces and tabs.
+    auto end = line_reader.ptr() + line_reader.size() - 2;
+    while (line_reader.ptr() < end && (end[-1] == ' ' || end[-1] == '\t')) {
+      end--;
+    }
+
+    // Horizontal tab and ' ' are considered whitespace and are ignored when on
+    // the left or right side of the header value:
+    //  - https://stackoverflow.com/questions/50179659/
+    //  - https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html
+    static const std::regex re(R"((.+?):[\t ]*(.+))");
+
     std::cmatch m;
-    if (std::regex_match(line_reader.ptr(), m, re)) {
+    if (std::regex_match(line_reader.ptr(), end, m, re)) {
       auto key = std::string(m[1]);
       auto val = std::string(m[2]);
       headers.emplace(key, val);
@@ -1881,38 +1933,39 @@ inline bool parse_multipart_boundary(const std::string &content_type,
 }
 
 inline bool parse_range_header(const std::string &s, Ranges &ranges) {
-  try {
+  static auto re_first_range =
-    static auto re_first_range =
+      std::regex(R"(bytes=(\d*-\d*(?:,\s*\d*-\d*)*))");
-        std::regex(R"(bytes=(\d*-\d*(?:,\s*\d*-\d*)*))");
+  std::smatch m;
-    std::smatch m;
+  if (std::regex_match(s, m, re_first_range)) {
-    if (std::regex_match(s, m, re_first_range)) {
+    auto pos = m.position(1);
-      auto pos = m.position(1);
+    auto len = m.length(1);
-      auto len = m.length(1);
+    bool all_valid_ranges = true;
-      detail::split(
+    detail::split(
-          &s[pos], &s[pos + len], ',', [&](const char *b, const char *e) {
+        &s[pos], &s[pos + len], ',', [&](const char *b, const char *e) {
-            static auto re_another_range = std::regex(R"(\s*(\d*)-(\d*))");
+          if (!all_valid_ranges) return;
-            std::cmatch m;
+          static auto re_another_range = std::regex(R"(\s*(\d*)-(\d*))");
-            if (std::regex_match(b, e, m, re_another_range)) {
+          std::cmatch m;
-              ssize_t first = -1;
+          if (std::regex_match(b, e, m, re_another_range)) {
-              if (!m.str(1).empty()) {
+            ssize_t first = -1;
-                first = static_cast<ssize_t>(std::stoll(m.str(1)));
+            if (!m.str(1).empty()) {
-              }
+              first = static_cast<ssize_t>(std::stoll(m.str(1)));
-
-              ssize_t last = -1;
-              if (!m.str(2).empty()) {
-                last = static_cast<ssize_t>(std::stoll(m.str(2)));
-              }
-
-              if (first != -1 && last != -1 && first > last) {
-                throw std::runtime_error("invalid range error");
-              }
-              ranges.emplace_back(std::make_pair(first, last));
             }
-          });
+
-      return true;
+            ssize_t last = -1;
-    }
+            if (!m.str(2).empty()) {
-    return false;
+              last = static_cast<ssize_t>(std::stoll(m.str(2)));
-  } catch (...) { return false; }
+            }
+
+            if (first != -1 && last != -1 && first > last) {
+              all_valid_ranges = false;
+              return;
+            }
+            ranges.emplace_back(std::make_pair(first, last));
+          }
+        });
+    return all_valid_ranges;
+  }
+  return false;
 }
 
 class MultipartFormDataParser {
@@ -2035,17 +2088,15 @@ public:
         break;
       }
       case 4: { // Boundary
-        auto pos = buf_.find(crlf_);
         if (crlf_.size() > buf_.size()) { return true; }
-        if (pos == 0) {
+        if (buf_.find(crlf_) == 0) {
           buf_.erase(0, crlf_.size());
           off_ += crlf_.size();
           state_ = 1;
         } else {
           auto pattern = dash_ + crlf_;
           if (pattern.size() > buf_.size()) { return true; }
-          auto pos = buf_.find(pattern);
+          if (buf_.find(pattern) == 0) {
-          if (pos == 0) {
             buf_.erase(0, pattern.size());
             off_ += pattern.size();
             is_valid_ = true;
@@ -2246,6 +2297,43 @@ inline bool expect_content(const Request &req) {
   return false;
 }
 
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+template <typename CTX, typename Init, typename Update, typename Final>
+inline std::string message_digest(const std::string &s, Init init,
+                                  Update update, Final final,
+                                  size_t digest_length) {
+  using namespace std;
+
+  unsigned char md[digest_length];
+  CTX ctx;
+  init(&ctx);
+  update(&ctx, s.data(), s.size());
+  final(md, &ctx);
+
+  stringstream ss;
+  for (auto c : md) {
+    ss << setfill('0') << setw(2) << hex << (unsigned int)c;
+  }
+  return ss.str();
+}
+
+inline std::string MD5(const std::string &s) {
+  using namespace detail;
+  return message_digest<MD5_CTX>(s, MD5_Init, MD5_Update, MD5_Final,
+                                 MD5_DIGEST_LENGTH);
+}
+
+inline std::string SHA_256(const std::string &s) {
+  return message_digest<SHA256_CTX>(s, SHA256_Init, SHA256_Update, SHA256_Final,
+                                    SHA256_DIGEST_LENGTH);
+}
+
+inline std::string SHA_512(const std::string &s) {
+  return message_digest<SHA512_CTX>(s, SHA512_Init, SHA512_Update, SHA512_Final,
+                                    SHA512_DIGEST_LENGTH);
+}
+#endif
+
 #ifdef _WIN32
 class WSInit {
 public:
@@ -2283,6 +2371,98 @@ make_basic_authentication_header(const std::string &username,
   return std::make_pair("Authorization", field);
 }
 
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+inline std::pair<std::string, std::string> make_digest_authentication_header(
+    const Request &req,
+    const std::map<std::string, std::string> &auth,
+    size_t cnonce_count, const std::string &cnonce,
+    const std::string &username, const std::string &password) {
+  using namespace std;
+
+  string nc;
+  {
+    stringstream ss;
+    ss << setfill('0') << setw(8) << hex << cnonce_count;
+    nc = ss.str();
+  }
+
+  auto qop = auth.at("qop");
+  if (qop.find("auth-int") != std::string::npos) {
+    qop = "auth-int";
+  } else {
+    qop = "auth";
+  }
+
+  string response;
+  {
+    auto algo = auth.at("algorithm");
+
+    auto H = algo == "SHA-256"
+                 ? detail::SHA_256
+                 : algo == "SHA-512" ? detail::SHA_512 : detail::MD5;
+
+    auto A1 = username + ":" + auth.at("realm") + ":" + password;
+
+    auto A2 = req.method + ":" + req.path;
+    if (qop == "auth-int") {
+      A2 += ":" + H(req.body);
+    }
+
+    response = H(H(A1) + ":" + auth.at("nonce") + ":" + nc + ":" + cnonce +
+                 ":" + qop + ":" + H(A2));
+  }
+
+  auto field = "Digest username=\"hello\", realm=\"" + auth.at("realm") +
+               "\", nonce=\"" + auth.at("nonce") + "\", uri=\"" + req.path +
+               "\", algorithm=" + auth.at("algorithm") + ", qop=" + qop + ", nc=\"" +
+               nc + "\", cnonce=\"" + cnonce + "\", response=\"" + response +
+               "\"";
+
+  return make_pair("Authorization", field);
+}
+#endif
+
+inline int parse_www_authenticate(const httplib::Response &res,
+                            std::map<std::string, std::string> &digest_auth) {
+  if (res.has_header("WWW-Authenticate")) {
+    static auto re = std::regex(R"~((?:(?:,\s*)?(.+?)=(?:"(.*?)"|([^,]*))))~");
+    auto s = res.get_header_value("WWW-Authenticate");
+    auto pos = s.find(' ');
+    if (pos != std::string::npos) {
+      auto type = s.substr(0, pos);
+      if (type == "Basic") {
+        return 1;
+      } else if (type == "Digest") {
+        s = s.substr(pos + 1);
+        auto beg = std::sregex_iterator(s.begin(), s.end(), re);
+        for (auto i = beg; i != std::sregex_iterator(); ++i) {
+          auto m = *i;
+          auto key = s.substr(m.position(1), m.length(1));
+          auto val = m.length(2) > 0 ? s.substr(m.position(2), m.length(2))
+                                     : s.substr(m.position(3), m.length(3));
+          digest_auth[key] = val;
+        }
+        return 2;
+      }
+    }
+  }
+  return 0;
+}
+
+// https://stackoverflow.com/questions/440133/how-do-i-create-a-random-alpha-numeric-string-in-c/440240#answer-440240
+inline std::string random_string(size_t length) {
+  auto randchar = []() -> char {
+    const char charset[] = "0123456789"
+                           "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                           "abcdefghijklmnopqrstuvwxyz";
+    const size_t max_index = (sizeof(charset) - 1);
+    return charset[rand() % max_index];
+  };
+  std::string str(length, 0);
+  std::generate_n(str.begin(), length, randchar);
+  return str;
+}
+
 // Request implementation
 inline bool Request::has_header(const char *key) const {
   return detail::has_header(headers, key);
@@ -2796,11 +2976,17 @@ Server::write_content_with_provider(Stream &strm, const Request &req,
 inline bool Server::read_content(Stream &strm, bool last_connection,
                                  Request &req, Response &res) {
   auto ret = read_content_core(strm, last_connection, req, res,
+    // Regular
     [&](const char *buf, size_t n) {
       if (req.body.size() + n > req.body.max_size()) { return false; }
       req.body.append(buf, n);
       return true;
     },
+    // Multipart
+    [&](const std::string &name, const MultipartFile &file) {
+      req.files.emplace(name, file);
+      return true;
+    },
     [&](const std::string &name, const char *buf, size_t n) {
       // TODO: handle elements with a same key
       auto it = req.files.find(name);
@@ -2808,10 +2994,6 @@ inline bool Server::read_content(Stream &strm, bool last_connection,
       if (content.size() + n > content.max_size()) { return false; }
       content.append(buf, n);
       return true;
-    },
-    [&](const std::string &name, const MultipartFile &file) {
-      req.files.emplace(name, file);
-      return true;
     }
   );
 
@@ -2827,18 +3009,18 @@ inline bool
 Server::read_content_with_content_receiver(Stream &strm, bool last_connection,
                                            Request &req, Response &res,
                                            ContentReceiver receiver,
-                                           MultipartContentReceiver multipart_receiver,
+                                           MultipartContentHeader multipart_header,
-                                           MultipartContentHeader multipart_header) {
+                                           MultipartContentReceiver multipart_receiver) {
   return read_content_core(strm, last_connection, req, res,
-      receiver, multipart_receiver, multipart_header);
+      receiver, multipart_header, multipart_receiver);
 }
 
 inline bool
 Server::read_content_core(Stream &strm, bool last_connection,
                           Request &req, Response &res,
                           ContentReceiver receiver,
-                          MultipartContentReceiver multipart_receiver,
+                          MultipartContentHeader mulitpart_header,
-                          MultipartContentHeader mulitpart_header) {
+                          MultipartContentReceiver multipart_receiver) {
   detail::MultipartFormDataParser multipart_form_data_parser;
   ContentReceiver out;
 
@@ -3001,9 +3183,9 @@ inline bool Server::routing(Request &req, Response &res, Stream &strm,
           return read_content_with_content_receiver(strm, last_connection, req, res,
                                                     receiver, nullptr, nullptr);
         },
-        [&](MultipartContentReceiver receiver, MultipartContentHeader header) {
+        [&](MultipartContentHeader header, MultipartContentReceiver receiver) {
           return read_content_with_content_receiver(strm, last_connection, req, res,
-                                                    nullptr, receiver, header);
+                                                    nullptr, header, receiver);
         }
       );
 
@@ -3164,22 +3346,7 @@ inline Client::~Client() {}
 inline bool Client::is_valid() const { return true; }
 
 inline socket_t Client::create_client_socket() const {
-  return detail::create_socket(
+  return detail::create_client_socket(host_.c_str(), port_, timeout_sec_);
-      host_.c_str(), port_, [=](socket_t sock, struct addrinfo &ai) -> bool {
-        detail::set_nonblocking(sock, true);
-
-        auto ret = connect(sock, ai.ai_addr, static_cast<int>(ai.ai_addrlen));
-        if (ret < 0) {
-          if (detail::is_connection_error() ||
-              !detail::wait_until_socket_is_ready(sock, timeout_sec_, 0)) {
-            detail::close_socket(sock);
-            return false;
-          }
-        }
-
-        detail::set_nonblocking(sock, false);
-        return true;
-      });
 }
 
 inline bool Client::read_response_line(Stream &strm, Response &res) {
@@ -3216,6 +3383,43 @@ inline bool Client::send(const Request &req, Response &res) {
     ret = redirect(req, res);
   }
 
+  if (ret && !username_.empty() && !password_.empty() && res.status == 401) {
+    int type;
+    std::map<std::string, std::string> digest_auth;
+
+    if ((type = parse_www_authenticate(res, digest_auth)) > 0) {
+      std::pair<std::string, std::string> header;
+
+      if (type == 1) {
+        header = make_basic_authentication_header(username_, password_);
+      } else if (type == 2) {
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+        size_t cnonce_count = 1;
+        auto cnonce = random_string(10);
+
+        header = make_digest_authentication_header(
+            req, digest_auth, cnonce_count, cnonce, username_, password_);
+#endif
+      }
+
+      Request new_req;
+      new_req.method = req.method;
+      new_req.path = req.path;
+      new_req.headers = req.headers;
+      new_req.body = req.body;
+      new_req.response_handler = req.response_handler;
+      new_req.content_receiver = req.content_receiver;
+      new_req.progress = req.progress;
+
+      new_req.headers.insert(header);
+
+      Response new_res;
+      auto ret = send(new_req, new_res);
+      if (ret) { res = new_res; }
+      return ret;
+    }
+  }
+
   return ret;
 }
 
@@ -3782,6 +3986,11 @@ inline void Client::set_read_timeout(time_t sec, time_t usec) {
 
 inline void Client::follow_location(bool on) { follow_location_ = on; }
 
+inline void Client::set_auth(const char *username, const char *password) {
+  username_ = username;
+  password_ = password;
+}
+
 /*
  * SSL Implementation
  */

test/test.cc

@@ -469,8 +469,50 @@ TEST(BaseAuthTest, FromHTTPWatch) {
               "{\n  \"authenticated\": true, \n  \"user\": \"hello\"\n}\n");
     EXPECT_EQ(200, res->status);
   }
+
+  {
+    cli.set_auth("hello", "world");
+    auto res = cli.Get("/basic-auth/hello/world");
+    ASSERT_TRUE(res != nullptr);
+    EXPECT_EQ(res->body,
+              "{\n  \"authenticated\": true, \n  \"user\": \"hello\"\n}\n");
+    EXPECT_EQ(200, res->status);
+  }
 }
 
+#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
+TEST(DigestAuthTest, FromHTTPWatch) {
+  auto host = "httpbin.org";
+  auto port = 443;
+  httplib::SSLClient cli(host, port);
+
+  {
+    auto res = cli.Get("/digest-auth/auth/hello/world");
+    ASSERT_TRUE(res != nullptr);
+    EXPECT_EQ(401, res->status);
+  }
+
+  {
+    std::vector<std::string> paths = {
+      "/digest-auth/auth/hello/world/MD5",
+      "/digest-auth/auth/hello/world/SHA-256",
+      "/digest-auth/auth/hello/world/SHA-512",
+      "/digest-auth/auth-init/hello/world/MD5",
+      "/digest-auth/auth-int/hello/world/MD5",
+    };
+
+    cli.set_auth("hello", "world");
+    for (auto path: paths) {
+      auto res = cli.Get(path.c_str());
+      ASSERT_TRUE(res != nullptr);
+      EXPECT_EQ(res->body,
+                "{\n  \"authenticated\": true, \n  \"user\": \"hello\"\n}\n");
+      EXPECT_EQ(200, res->status);
+    }
+  }
+}
+#endif
+
 TEST(AbsoluteRedirectTest, Redirect) {
   auto host = "httpbin.org";
 
@@ -761,14 +803,14 @@ protected:
                 if (req.is_multipart_form_data()) {
                   MultipartFiles files;
                   content_reader(
+                    [&](const std::string &name, const MultipartFile &file) {
+                      files.emplace(name, file);
+                      return true;
+                    },
                     [&](const std::string &name, const char *data, size_t data_length) {
                       auto &file = files.find(name)->second;
                       file.content.append(data, data_length);
                       return true;
-                    },
-                    [&](const std::string &name, const MultipartFile &file) {
-                      files.emplace(name, file);
-                      return true;
                     });
 
                   EXPECT_EQ(5u, files.size());
@@ -1357,7 +1399,7 @@ TEST_F(ServerTest, GetStreamedWithRangeMultipart) {
 }
 
 TEST_F(ServerTest, GetStreamedEndless) {
-  size_t offset = 0;
+  uint64_t offset = 0;
   auto res = cli_.Get("/streamed-cancel",
                       [&](const char * /*data*/, uint64_t data_length) {
                         if (offset < 100) {
@@ -1766,6 +1808,89 @@ TEST_F(ServerTest, MultipartFormDataGzip) {
 }
 #endif
 
+// Sends a raw request to a server listening at HOST:PORT.
+static bool send_request(time_t read_timeout_sec, const std::string& req) {
+  auto client_sock =
+      detail::create_client_socket(HOST, PORT, /*timeout_sec=*/5);
+
+  if (client_sock == INVALID_SOCKET) { return false; }
+
+  return detail::process_and_close_socket(
+      true, client_sock, 1, read_timeout_sec, 0,
+      [&](Stream& strm, bool /*last_connection*/,
+          bool &/*connection_close*/) -> bool {
+        if (req.size() !=
+            static_cast<size_t>(strm.write(req.data(), req.size()))) {
+          return false;
+        }
+
+        char buf[512];
+
+        detail::stream_line_reader line_reader(strm, buf, sizeof(buf));
+        while (line_reader.getline()) {}
+        return true;
+      });
+}
+
+TEST(ServerRequestParsingTest, TrimWhitespaceFromHeaderValues) {
+  Server svr;
+  std::string header_value;
+  svr.Get("/validate-ws-in-headers",
+          [&](const Request &req, Response &res) {
+            header_value = req.get_header_value("foo");
+            res.set_content("ok", "text/plain");
+          });
+
+  thread t = thread([&] { svr.listen(HOST, PORT); });
+  while (!svr.is_running()) {
+    msleep(1);
+  }
+
+  // Only space and horizontal tab are whitespace. Make sure other whitespace-
+  // like characters are not treated the same - use vertical tab and escape.
+  const std::string req =
+      "GET /validate-ws-in-headers HTTP/1.1\r\n"
+      "foo: \t \v bar \e\t \r\n"
+      "Connection: close\r\n"
+      "\r\n";
+
+  ASSERT_TRUE(send_request(5, req));
+  svr.stop();
+  t.join();
+  EXPECT_EQ(header_value, "\v bar \e");
+}
+
+TEST(ServerRequestParsingTest, ReadHeadersRegexComplexity) {
+  Server svr;
+  svr.Get("/hi",
+          [&](const Request & /*req*/, Response &res) {
+            res.set_content("ok", "text/plain");
+          });
+
+  // Server read timeout must be longer than the client read timeout for the
+  // bug to reproduce, probably to force the server to process a request
+  // without a trailing blank line.
+  const time_t client_read_timeout_sec = 1;
+  svr.set_read_timeout(client_read_timeout_sec + 1, 0);
+  bool listen_thread_ok = false;
+  thread t = thread([&] { listen_thread_ok = svr.listen(HOST, PORT); });
+  while (!svr.is_running()) {
+    msleep(1);
+  }
+
+  // A certain header line causes an exception if the header property is parsed
+  // naively with a single regex. This occurs with libc++ but not libstdc++.
+  const std::string req =
+      "GET /hi HTTP/1.1\r\n"
+      " :                                                                      "
+      "                                                                       ";
+
+  ASSERT_TRUE(send_request(client_read_timeout_sec, req));
+  svr.stop();
+  t.join();
+  EXPECT_TRUE(listen_thread_ok);
+}
+
 class ServerTestWithAI_PASSIVE : public ::testing::Test {
 protected:
   ServerTestWithAI_PASSIVE()