diff --git a/configure.ac b/configure.ac
index 07dccfe..72a5462 100644
--- a/configure.ac
+++ b/configure.ac
@@ -95,6 +95,13 @@ if test "x${have_openssl}" = "xno"; then
   AC_MSG_NOTICE([The example programs will not be built.])
 fi
 
+# libxml2 (for examples/spdycat)
+AM_PATH_XML2(2.7.7, [have_libxml2=yes])
+if test "x${have_libxml2}" = "xyes"; then
+  AC_DEFINE([HAVE_LIBXML2], [1], [Define to 1 if you have `libxml2` library.])
+fi
+AM_CONDITIONAL([HAVE_LIBXML2], [ test "x${have_libxml2}" = "xyes" ])
+
 # The example programs depend on OpenSSL
 enable_examples=$have_openssl
 AM_CONDITIONAL([ENABLE_EXAMPLES], [ test "x${enable_examples}" = "xyes" ])
diff --git a/examples/Makefile.am b/examples/Makefile.am
index e89c469..392c819 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -25,8 +25,8 @@ if ENABLE_EXAMPLES
 
 AM_CFLAGS = -Wall
 AM_CPPFLAGS = -Wall -I$(srcdir)/../lib/includes -I$(builddir)/../lib/includes \
-	@OPENSSL_CFLAGS@ @DEFS@
-AM_LDFLAGS = @OPENSSL_LIBS@
+	@OPENSSL_CFLAGS@ @XML_CPPFLAGS@ @DEFS@
+AM_LDFLAGS = @OPENSSL_LIBS@ @XML_LIBS@
 LDADD = $(top_builddir)/lib/libspdylay.la
 
 bin_PROGRAMS = spdycat spdyd
@@ -47,10 +47,18 @@ EVENT_OBJECTS += EventPoll_kqueue.cc
 EVENT_HFILES += EventPoll_kqueue.h
 endif # HAVE_KQUEUE
 
+HTML_PARSER_OBJECTS =
+HTML_PARSER_HFILES = HtmlParser.h
+
+if HAVE_LIBXML2
+HTML_PARSER_OBJECTS += HtmlParser.cc
+endif # HAVE_LIBXML2
+
 SPDY_SERVER_OBJECTS = SpdyServer.cc
 SPDY_SERVER_HFILES = SpdyServer.h
 
-spdycat_SOURCES = ${HELPER_OBJECTS} ${HELPER_HFILES} spdycat.cc
+spdycat_SOURCES = ${HELPER_OBJECTS} ${HELPER_HFILES} spdycat.cc \
+	${HTML_PARSER_OBJECTS} ${HTML_PARSER_HFILES}
 
 spdyd_SOURCES = ${HELPER_OBJECTS} ${HELPER_HFILES} \
 	${EVENT_OBJECTS} ${EVENT_HFILES} \
diff --git a/examples/spdycat.cc b/examples/spdycat.cc
index 28e60d5..01349a7 100644
--- a/examples/spdycat.cc
+++ b/examples/spdycat.cc
@@ -22,6 +22,8 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
+#include <config.h>
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netdb.h>
@@ -54,6 +56,8 @@
 
 #include "spdylay_ssl.h"
 #include "uri.h"
+#include "HtmlParser.h"
+#include "util.h"
 
 namespace spdylay {
 
@@ -61,22 +65,31 @@ struct Config {
   bool null_out;
   bool remote_name;
   bool verbose;
+  bool get_assets;
   int spdy_version;
   int timeout;
   std::string certfile;
   std::string keyfile;
   int window_bits;
   Config():null_out(false), remote_name(false), verbose(false),
-           spdy_version(-1), timeout(-1), window_bits(-1) {}
+           get_assets(false), spdy_version(-1), timeout(-1), window_bits(-1)
+  {}
 };
 
 struct Request {
   uri::UriStruct us;
   spdylay_gzip *inflater;
-  Request(const uri::UriStruct& us):us(us), inflater(0) {}
+  HtmlParser *html_parser;
+  // Recursion level: 0: first entity, 1: entity linked from first entity
+  int level;
+  Request(const uri::UriStruct& us, int level = 0)
+    : us(us), inflater(0), html_parser(0), level(level)
+  {}
+
   ~Request()
   {
     spdylay_gzip_inflate_del(inflater);
+    delete html_parser;
   }
 
   void init_inflater()
@@ -85,20 +98,122 @@ struct Request {
     rv = spdylay_gzip_inflate_new(&inflater);
     assert(rv == 0);
   }
+
+  void init_html_parser()
+  {
+    html_parser = new HtmlParser(uri::construct(us));
+  }
+
+  int update_html_parser(const uint8_t *data, size_t len, int fin)
+  {
+    if(!html_parser) {
+      return 0;
+    }
+    int rv;
+    rv = html_parser->parse_chunk(reinterpret_cast<const char*>(data), len,
+                                  fin);
+    return rv;
+  }
 };
 
-std::map<int32_t, Request*> stream2req;
-size_t numreq, complete;
+struct SpdySession {
+  std::vector<Request*> reqvec;
+  // Map from stream ID to Request object.
+  std::map<int32_t, Request*> streams;
+  // Insert path already added in reqvec to prevent multiple request
+  // for 1 resource.
+  std::set<std::string> path_cache;
+  // The number of completed requests, including failed ones.
+  size_t complete;
+  std::string hostport;
+  Spdylay *sc;
+  SpdySession():complete(0) {}
+  ~SpdySession()
+  {
+    for(size_t i = 0; i < reqvec.size(); ++i) {
+      delete reqvec[i];
+    }
+  }
+  bool all_requests_processed() const
+  {
+    return complete == reqvec.size();
+  }
+  void update_hostport()
+  {
+    if(reqvec.empty()) {
+      return;
+    }
+    std::stringstream ss;
+    if(reqvec[0]->us.ipv6LiteralAddress) {
+      ss << "[" << reqvec[0]->us.host << "]";
+    } else {
+      ss << reqvec[0]->us.host;
+    }
+    if(reqvec[0]->us.port != 443) {
+      ss << ":" << reqvec[0]->us.port;
+    }
+    hostport = ss.str();
+  }
+  bool add_request(const uri::UriStruct& us, int level = 0)
+  {
+    std::string key = us.dir+us.file+us.query;
+    if(path_cache.count(key)) {
+      return false;
+    } else {
+      path_cache.insert(key);
+      reqvec.push_back(new Request(us, level));
+      return true;
+    }
+  }
+};
 
 Config config;
 extern bool ssl_debug;
 
+void submit_request(Spdylay& sc, const std::string& hostport, Request* req)
+{
+  uri::UriStruct& us = req->us;
+  std::string path = us.dir+us.file+us.query;
+  int r = sc.submit_request(hostport, path, 3, req);
+  assert(r == 0);
+}
+
+void update_html_parser(SpdySession *spdySession, Request *req,
+                        const uint8_t *data, size_t len, int fin)
+{
+  if(!req->html_parser) {
+    return;
+  }
+  req->update_html_parser(data, len, fin);
+
+  for(size_t i = 0; i < req->html_parser->get_links().size(); ++i) {
+    const std::string& uri = req->html_parser->get_links()[i];
+    uri::UriStruct us;
+    if(uri::parse(us, uri) &&
+       req->us.protocol == us.protocol && req->us.host == us.host &&
+       req->us.port == us.port) {
+      spdySession->add_request(us, req->level+1);
+      submit_request(*spdySession->sc, spdySession->hostport,
+                     spdySession->reqvec.back());
+    }
+  }
+  req->html_parser->clear_links();
+}
+
+SpdySession* get_session(void *user_data)
+{
+  return reinterpret_cast<SpdySession*>
+    (reinterpret_cast<Spdylay*>(user_data)->user_data());
+}
+
 void on_data_chunk_recv_callback
 (spdylay_session *session, uint8_t flags, int32_t stream_id,
  const uint8_t *data, size_t len, void *user_data)
 {
-  std::map<int32_t, Request*>::iterator itr = stream2req.find(stream_id);
-  if(itr != stream2req.end()) {
+  SpdySession *spdySession = get_session(user_data);
+  std::map<int32_t, Request*>::iterator itr =
+    spdySession->streams.find(stream_id);
+  if(itr != spdySession->streams.end()) {
     Request *req = (*itr).second;
     if(req->inflater) {
       while(len > 0) {
@@ -111,23 +226,31 @@ void on_data_chunk_recv_callback
           spdylay_submit_rst_stream(session, stream_id, SPDYLAY_INTERNAL_ERROR);
           break;
         }
-        std::cout.write(reinterpret_cast<const char*>(out), outlen);
+        if(!config.null_out) {
+          std::cout.write(reinterpret_cast<const char*>(out), outlen);
+        }
+        update_html_parser(spdySession, req, out, outlen, 0);
         data += tlen;
         len -= tlen;
       }
     } else {
-      std::cout.write(reinterpret_cast<const char*>(data), len);
+      if(!config.null_out) {
+        std::cout.write(reinterpret_cast<const char*>(data), len);
+      }
+      update_html_parser(spdySession, req, data, len, 0);
     }
   }
 }
 
 void check_stream_id(spdylay_session *session,
-                     spdylay_frame_type type, spdylay_frame *frame)
+                     spdylay_frame_type type, spdylay_frame *frame,
+                     void *user_data)
 {
+  SpdySession *spdySession = get_session(user_data);
   int32_t stream_id = frame->syn_stream.stream_id;
   Request *req = (Request*)spdylay_session_get_stream_user_data(session,
                                                                 stream_id);
-  stream2req[stream_id] = req;
+  spdySession->streams[stream_id] = req;
 }
 
 void on_ctrl_send_callback2
@@ -135,7 +258,7 @@ void on_ctrl_send_callback2
  void *user_data)
 {
   if(type == SPDYLAY_SYN_STREAM) {
-    check_stream_id(session, type, frame);
+    check_stream_id(session, type, frame, user_data);
   }
 }
 
@@ -144,12 +267,12 @@ void on_ctrl_send_callback3
  void *user_data)
 {
   if(type == SPDYLAY_SYN_STREAM) {
-    check_stream_id(session, type, frame);
+    check_stream_id(session, type, frame, user_data);
   }
   on_ctrl_send_callback(session, type, frame, user_data);
 }
 
-void check_gzip
+void check_response_header
 (spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
  void *user_data)
 {
@@ -164,21 +287,24 @@ void check_gzip
   } else {
     return;
   }
+  Request *req = (Request*)spdylay_session_get_stream_user_data(session,
+                                                                stream_id);
+  assert(req);
   bool gzip = false;
   for(size_t i = 0; nv[i]; i += 2) {
     if(strcmp("content-encoding", nv[i]) == 0) {
-      gzip = strcmp("gzip", nv[i+1]) == 0;
-      break;
+      gzip = util::strieq("gzip", nv[i+1]) || util::strieq("deflate", nv[i+1]);
     }
   }
   if(gzip) {
-    Request *req = (Request*)spdylay_session_get_stream_user_data(session,
-                                                                  stream_id);
-    assert(req);
-    if(req->inflater) {
-      return;
+    if(!req->inflater) {
+      req->init_inflater();
+    }
+  }
+  if(config.get_assets && req->level == 0) {
+    if(!req->html_parser) {
+      req->init_html_parser();
     }
-    req->init_inflater();
   }
 }
 
@@ -186,14 +312,14 @@ void on_ctrl_recv_callback2
 (spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
  void *user_data)
 {
-  check_gzip(session, type, frame, user_data);
+  check_response_header(session, type, frame, user_data);
 }
 
 void on_ctrl_recv_callback3
 (spdylay_session *session, spdylay_frame_type type, spdylay_frame *frame,
  void *user_data)
 {
-  check_gzip(session, type, frame, user_data);
+  check_response_header(session, type, frame, user_data);
   on_ctrl_recv_callback(session, type, frame, user_data);
 }
 
@@ -201,23 +327,22 @@ void on_stream_close_callback
 (spdylay_session *session, int32_t stream_id, spdylay_status_code status_code,
  void *user_data)
 {
-  std::map<int32_t, Request*>::iterator itr = stream2req.find(stream_id);
-  if(itr != stream2req.end()) {
-    ++complete;
-    if(complete == numreq) {
+  SpdySession *spdySession = get_session(user_data);
+  std::map<int32_t, Request*>::iterator itr =
+    spdySession->streams.find(stream_id);
+  if(itr != spdySession->streams.end()) {
+    update_html_parser(spdySession, (*itr).second, 0, 0, 1);
+    ++spdySession->complete;
+    if(spdySession->all_requests_processed()) {
       spdylay_submit_goaway(session, SPDYLAY_GOAWAY_OK);
     }
-    stream2req.erase(itr);
   }
 }
 
 int communicate(const std::string& host, uint16_t port,
-                std::vector<Request>& reqvec,
+                SpdySession& spdySession,
                 const spdylay_session_callbacks *callbacks)
 {
-  numreq = reqvec.size();
-  complete = 0;
-  stream2req.clear();
   int fd = connect_to(host, port);
   if(fd == -1) {
     std::cerr << "Could not connect to the host" << std::endl;
@@ -269,23 +394,12 @@ int communicate(const std::string& host, uint16_t port,
   if (spdy_version <= 0) {
     return -1;
   }
-  Spdylay sc(fd, ssl, spdy_version, callbacks);
+  Spdylay sc(fd, ssl, spdy_version, callbacks, &spdySession);
+  spdySession.sc = &sc;
 
   nfds_t npollfds = 1;
   pollfd pollfds[1];
 
-  std::stringstream ss;
-  if(reqvec[0].us.ipv6LiteralAddress) {
-    ss << "[";
-  }
-  ss << host;
-  if(reqvec[0].us.ipv6LiteralAddress) {
-    ss << "]";
-  }
-  if(port != 443) {
-    ss << ":" << port;
-  }
-  std::string hostport = ss.str();
   if(spdy_version >= SPDYLAY_PROTO_SPDY3 && config.window_bits != -1) {
     spdylay_settings_entry iv[1];
     iv[0].settings_id = SPDYLAY_SETTINGS_INITIAL_WINDOW_SIZE;
@@ -294,11 +408,8 @@ int communicate(const std::string& host, uint16_t port,
     int rv = sc.submit_settings(SPDYLAY_FLAG_SETTINGS_NONE, iv, 1);
     assert(rv == 0);
   }
-  for(int i = 0, n = reqvec.size(); i < n; ++i) {
-    uri::UriStruct& us = reqvec[i].us;
-    std::string path = us.dir+us.file+us.query;
-    int r = sc.submit_request(hostport, path, 3, &reqvec[i]);
-    assert(r == 0);
+  for(int i = 0, n = spdySession.reqvec.size(); i < n; ++i) {
+    submit_request(sc, spdySession.hostport, spdySession.reqvec[i]);
   }
   pollfds[0].fd = fd;
   ctl_poll(pollfds, &sc);
@@ -315,8 +426,10 @@ int communicate(const std::string& host, uint16_t port,
     if(pollfds[0].revents & (POLLIN | POLLOUT)) {
       int rv;
       if((rv = sc.recv()) != 0 || (rv = sc.send()) != 0) {
-        if(rv != SPDYLAY_ERR_EOF || complete != numreq) {
+        if(rv != SPDYLAY_ERR_EOF || !spdySession.all_requests_processed()) {
           std::cout << "Fatal: " << spdylay_strerror(rv) << std::endl;
+          std::cout << "reqnum=" << spdySession.reqvec.size()
+                    << ", completed=" << spdySession.complete << std::endl;
         }
         ok = false;
         break;
@@ -329,14 +442,18 @@ int communicate(const std::string& host, uint16_t port,
     }
     timeout = timeout == -1 ? timeout : end_time - time(NULL);
     if (config.timeout != -1 && timeout <= 0) {
-      std::cout << "Requests to " << hostport << "timed out.";
+      std::cout << "Requests to " << spdySession.hostport << "timed out.";
       ok = false;
       break;
     }
     assert(ok);
     ctl_poll(pollfds, &sc);
   }
-
+  if(!spdySession.all_requests_processed()) {
+    std::cout << "Some requests were not processed. total="
+              << spdySession.reqvec.size()
+              << ", processed=" << spdySession.complete << std::endl;
+  }
   SSL_shutdown(ssl);
   SSL_free(ssl);
   SSL_CTX_free(ssl_ctx);
@@ -364,32 +481,32 @@ int run(char **uris, int n)
     callbacks.on_ctrl_recv_callback = on_ctrl_recv_callback2;
     callbacks.on_ctrl_send_callback = on_ctrl_send_callback2;
   }
-  if(!config.null_out) {
-    callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
-  }
+  callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
   ssl_debug = config.verbose;
-  std::vector<Request> reqvec;
   std::string prev_host;
   uint16_t prev_port = 0;
   int failures = 0;
+  SpdySession spdySession;
   for(int i = 0; i < n; ++i) {
     uri::UriStruct us;
     if(uri::parse(us, uris[i])) {
       if(prev_host != us.host || prev_port != us.port) {
-        if(!reqvec.empty()) {
-          if (communicate(prev_host, prev_port, reqvec, &callbacks) != 0) {
+        if(!spdySession.reqvec.empty()) {
+          spdySession.update_hostport();
+          if (communicate(prev_host, prev_port, spdySession, &callbacks) != 0) {
             ++failures;
           }
-          reqvec.clear();
+          spdySession = SpdySession();
         }
         prev_host = us.host;
         prev_port = us.port;
       }
-      reqvec.push_back(Request(us));
+      spdySession.add_request(us);
     }
   }
-  if(!reqvec.empty()) {
-    if (communicate(prev_host, prev_port, reqvec, &callbacks) != 0) {
+  if(!spdySession.reqvec.empty()) {
+    spdySession.update_hostport();
+    if (communicate(prev_host, prev_port, spdySession, &callbacks) != 0) {
       ++failures;
     }
   }
@@ -398,7 +515,7 @@ int run(char **uris, int n)
 
 void print_usage(std::ostream& out)
 {
-  out << "Usage: spdycat [-Onv23] [-t <SECONDS>] [-w <WINDOW_BITS>] [--cert=<CERT>]\n"
+  out << "Usage: spdycat [-Oanv23] [-t <SECONDS>] [-w <WINDOW_BITS>] [--cert=<CERT>]\n"
       << "               [--key=<KEY>] <URI>..."
       << std::endl;
 }
@@ -420,6 +537,11 @@ void print_help(std::ostream& out)
       << "    -t, --timeout=<N>  Timeout each request after <N> seconds.\n"
       << "    -w, --window-bits=<N>\n"
       << "                       Sets the initial window size to 2**<N>.\n"
+      << "    -a, --get-assets   Download assets such as stylesheets, images\n"
+      << "                       and script files linked from the downloaded\n"
+      << "                       resource. Only links whose origins are the\n"
+      << "                       same with the linking resource will be\n"
+      << "                       downloaded.\n"
       << "    --cert=<CERT>      Use the specified client certificate file.\n"
       << "                       The file must be in PEM format.\n"
       << "    --key=<KEY>        Use the client private key file. The file\n"
@@ -439,13 +561,14 @@ int main(int argc, char **argv)
       {"spdy3", no_argument, 0, '3' },
       {"timeout", required_argument, 0, 't' },
       {"window-bits", required_argument, 0, 'w' },
+      {"get-assets", no_argument, 0, 'a' },
       {"cert", required_argument, &flag, 1 },
       {"key", required_argument, &flag, 2 },
       {"help", no_argument, 0, 'h' },
       {0, 0, 0, 0 }
     };
     int option_index = 0;
-    int c = getopt_long(argc, argv, "Onhv23t:w:", long_options, &option_index);
+    int c = getopt_long(argc, argv, "Oanhv23t:w:", long_options, &option_index);
     if(c == -1) {
       break;
     }
@@ -483,6 +606,15 @@ int main(int argc, char **argv)
       }
       break;
     }
+    case 'a':
+#ifdef HAVE_LIBXML2
+      config.get_assets = true;
+#else // !HAVE_LIBXML2
+      std::cerr << "Warning: -a, --get-assets option cannot be used because\n"
+                << "the binary was not compiled with libxml2."
+                << std::endl;
+#endif // !HAVE_LIBXML2
+      break;
     case '?':
       exit(EXIT_FAILURE);
     case 0:
diff --git a/examples/spdylay_ssl.cc b/examples/spdylay_ssl.cc
index 0014103..3895823 100644
--- a/examples/spdylay_ssl.cc
+++ b/examples/spdylay_ssl.cc
@@ -49,8 +49,10 @@ namespace spdylay {
 bool ssl_debug = false;
 
 Spdylay::Spdylay(int fd, SSL *ssl, uint16_t version,
-                 const spdylay_session_callbacks *callbacks)
-  : fd_(fd), ssl_(ssl), version_(version), want_write_(false)
+                 const spdylay_session_callbacks *callbacks,
+                 void *user_data)
+  : fd_(fd), ssl_(ssl), version_(version), user_data_(user_data),
+    want_write_(false)
 {
   int r = spdylay_session_client_new(&session_, version_, callbacks, this);
   assert(r == 0);
@@ -114,6 +116,11 @@ int Spdylay::fd() const
   return fd_;
 }
 
+void* Spdylay::user_data()
+{
+  return user_data_;
+}
+
 int Spdylay::submit_request(const std::string& hostport,
                             const std::string& path, uint8_t pri,
                             void *stream_user_data)
diff --git a/examples/spdylay_ssl.h b/examples/spdylay_ssl.h
index b7fc288..03e3f5a 100644
--- a/examples/spdylay_ssl.h
+++ b/examples/spdylay_ssl.h
@@ -41,7 +41,8 @@ extern bool ssl_debug;
 class Spdylay {
 public:
   Spdylay(int fd, SSL *ssl, uint16_t version,
-          const spdylay_session_callbacks *callbacks);
+          const spdylay_session_callbacks *callbacks,
+          void *user_data);
   ~Spdylay();
   int recv();
   int send();
@@ -55,11 +56,13 @@ public:
                      uint8_t pri, void *stream_user_data);
   int submit_settings(int flags, spdylay_settings_entry *iv, size_t niv);
   bool would_block(int r);
+  void* user_data();
 private:
   int fd_;
   SSL *ssl_;
   uint16_t version_;
   spdylay_session *session_;
+  void *user_data_;
   bool want_write_;
   bool debug_;
 };
diff --git a/examples/util.cc b/examples/util.cc
index a2cda70..ec22dc8 100644
--- a/examples/util.cc
+++ b/examples/util.cc
@@ -119,10 +119,55 @@ time_t parse_http_date(const std::string& s)
   return timegm(&tm);
 }
 
+namespace {
+char lowcase(char c)
+{
+  if('A' <= c && c <= 'Z') {
+    return c+('a'-'A');
+  } else {
+    return c;
+  }
+}
+} // namespace
+
+bool startsWith(const std::string& a, const std::string& b)
+{
+  return startsWith(a.begin(), a.end(), b.begin(), b.end());
+}
+
+bool istartsWith(const std::string& a, const std::string& b)
+{
+  return istartsWith(a.begin(), a.end(), b.begin(), b.end());
+}
+
+namespace {
+void streq_advance(const char **ap, const char **bp)
+{
+  for(; **ap && **bp && lowcase(**ap) == lowcase(**bp); ++*ap, ++*bp);
+}
+} // namespace
+
+bool istartsWith(const char *a, const char* b)
+{
+  if(!a || !b) {
+    return false;
+  }
+  streq_advance(&a, &b);
+  return !*b;
+}
+
 bool endsWith(const std::string& a, const std::string& b)
 {
   return endsWith(a.begin(), a.end(), b.begin(), b.end());
 }
+bool strieq(const char *a, const char *b)
+{
+  if(!a || !b) {
+    return false;
+  }
+  for(; *a && *b && lowcase(*a) == lowcase(*b); ++a, ++b);
+  return !*a && !*b;
+}
 
 } // namespace util
 
diff --git a/examples/util.h b/examples/util.h
index f2f549a..d997995 100644
--- a/examples/util.h
+++ b/examples/util.h
@@ -174,6 +174,50 @@ std::string to_str(T value)
   return ss.str();
 }
 
+template<typename InputIterator1, typename InputIterator2>
+bool startsWith
+(InputIterator1 first1,
+ InputIterator1 last1,
+ InputIterator2 first2,
+ InputIterator2 last2)
+{
+  if(last1-first1 < last2-first2) {
+    return false;
+  }
+  return std::equal(first2, last2, first1);
+}
+
+bool startsWith(const std::string& a, const std::string& b);
+
+struct CaseCmp {
+  bool operator()(char lhs, char rhs) const
+  {
+    if('A' <= lhs && lhs <= 'Z') {
+      lhs += 'a'-'A';
+    }
+    if('A' <= rhs && rhs <= 'Z') {
+      rhs += 'a'-'A';
+    }
+    return lhs == rhs;
+  }
+};
+
+template<typename InputIterator1, typename InputIterator2>
+bool istartsWith
+(InputIterator1 first1,
+ InputIterator1 last1,
+ InputIterator2 first2,
+ InputIterator2 last2)
+{
+  if(last1-first1 < last2-first2) {
+    return false;
+  }
+  return std::equal(first2, last2, first1, CaseCmp());
+}
+
+bool istartsWith(const std::string& a, const std::string& b);
+bool istartsWith(const char *a, const char* b);
+
 template<typename InputIterator1, typename InputIterator2>
 bool endsWith
 (InputIterator1 first1,
@@ -189,6 +233,8 @@ bool endsWith
 
 bool endsWith(const std::string& a, const std::string& b);
 
+bool strieq(const char *a, const char *b);
+
 } // namespace util
 
 } // namespace spdylay