diff --git a/src/http2.cc b/src/http2.cc
index 0fe82678..58b49977 100644
--- a/src/http2.cc
+++ b/src/http2.cc
@@ -179,6 +179,7 @@ size_t IGN_HDLEN = sizeof(IGN_HD)/sizeof(IGN_HD[0]);
 namespace {
 const char *HTTP1_IGN_HD[] = {
   "connection",
+  "cookie",
   "expect",
   "http2-settings",
   "keep-alive",
diff --git a/src/http2.h b/src/http2.h
index 8713d22d..eea19e1d 100644
--- a/src/http2.h
+++ b/src/http2.h
@@ -106,7 +106,7 @@ void copy_norm_headers_to_nv
 
 // Appends HTTP/1.1 style header lines to |hdrs| from headers in
 // |headers|. Certain headers, which requires special handling
-// (i.e. via), are not appended.
+// (i.e. via and cookie), are not appended.
 void build_http1_headers_from_norm_headers
 (std::string& hdrs,
  const std::vector<std::pair<std::string, std::string>>& headers);
diff --git a/src/shrpx-unittest.cc b/src/shrpx-unittest.cc
index 77108dc6..a3469888 100644
--- a/src/shrpx-unittest.cc
+++ b/src/shrpx-unittest.cc
@@ -92,6 +92,10 @@ int main(int argc, char* argv[])
                    shrpx::test_downstream_get_norm_request_header) ||
       !CU_add_test(pSuite, "downstream_get_norm_response_header",
                    shrpx::test_downstream_get_norm_response_header) ||
+      !CU_add_test(pSuite, "downstream_crumble_request_cookie",
+                   shrpx::test_downstream_crumble_request_cookie) ||
+      !CU_add_test(pSuite, "downstream_assemble_request_cookie",
+                   shrpx::test_downstream_assemble_request_cookie) ||
       !CU_add_test(pSuite, "util_streq", shrpx::test_util_streq) ||
       !CU_add_test(pSuite, "util_inp_strlower",
                    shrpx::test_util_inp_strlower) ||
diff --git a/src/shrpx_downstream.cc b/src/shrpx_downstream.cc
index 414e9caa..d1ffb988 100644
--- a/src/shrpx_downstream.cc
+++ b/src/shrpx_downstream.cc
@@ -178,6 +178,69 @@ const Headers& Downstream::get_request_headers() const
   return request_headers_;
 }
 
+void Downstream::assemble_request_cookie()
+{
+  std::string& cookie = assembled_request_cookie_;
+  cookie = "";
+  for(auto& kv : request_headers_) {
+    if(util::strieq("cookie", kv.first.c_str())) {
+      auto end = kv.second.find_last_not_of(" ;");
+      if(end == std::string::npos) {
+        cookie += kv.second;
+      } else {
+        cookie.append(std::begin(kv.second), std::begin(kv.second) + end + 1);
+      }
+      cookie += "; ";
+    }
+  }
+  if(cookie.size() >= 2) {
+    cookie.erase(cookie.size() - 2);
+  }
+}
+
+void Downstream::crumble_request_cookie()
+{
+  Headers cookie_hdrs;
+  for(auto& kv : request_headers_) {
+    if(util::strieq("cookie", kv.first.c_str())) {
+      size_t last = kv.second.size();
+      size_t num = 0;
+      std::string rep_cookie;
+
+      for(size_t j = 0; j < last;) {
+        j = kv.second.find_first_not_of("\t ;", j);
+        if(j == std::string::npos) {
+          break;
+        }
+        auto first = j;
+
+        j = kv.second.find(';', j);
+        if(j == std::string::npos) {
+          j = last;
+        }
+
+        if(num == 0) {
+          rep_cookie = kv.second.substr(first, j - first);
+        } else {
+          cookie_hdrs.push_back
+            (std::make_pair("cookie", kv.second.substr(first, j - first)));
+        }
+        ++num;
+      }
+      if(num > 0) {
+        kv.second = std::move(rep_cookie);
+      }
+    }
+  }
+  request_headers_.insert(std::end(request_headers_),
+                          std::begin(cookie_hdrs), std::end(cookie_hdrs));
+}
+
+const std::string& Downstream::get_assembled_request_cookie() const
+{
+  return assembled_request_cookie_;
+}
+
 void Downstream::normalize_request_headers()
 {
   normalize_headers(request_headers_);
diff --git a/src/shrpx_downstream.h b/src/shrpx_downstream.h
index 91290d7b..9b81d1ed 100644
--- a/src/shrpx_downstream.h
+++ b/src/shrpx_downstream.h
@@ -82,6 +82,9 @@ public:
   bool http2_upgrade_request() const;
   // downstream request API
   const Headers& get_request_headers() const;
+  void crumble_request_cookie();
+  void assemble_request_cookie();
+  const std::string& get_assembled_request_cookie() const;
   // Makes key lowercase and sort headers by name using <
   void normalize_request_headers();
   // Returns iterator pointing to the request header with the name
@@ -197,6 +200,7 @@ private:
   bool chunked_request_;
   bool request_connection_close_;
   bool request_expect_100_continue_;
+  std::string assembled_request_cookie_;
   Headers request_headers_;
   bool request_header_key_prev_;
   // the length of request body
diff --git a/src/shrpx_downstream_test.cc b/src/shrpx_downstream_test.cc
index ce3f2de3..2a0ab18b 100644
--- a/src/shrpx_downstream_test.cc
+++ b/src/shrpx_downstream_test.cc
@@ -110,4 +110,40 @@ void test_downstream_get_norm_response_header(void)
   CU_ASSERT(i == std::end(d.get_response_headers()));
 }
 
+void test_downstream_crumble_request_cookie(void)
+{
+  Downstream d(nullptr, 0, 0);
+  d.add_request_header(":method", "get");
+  d.add_request_header(":path", "/");
+  d.add_request_header("cookie", "alpha; bravo; ; ;; charlie;;");
+  d.add_request_header("cookie", ";delta");
+  d.add_request_header("cookie", "echo");
+  d.crumble_request_cookie();
+  Headers ans = {
+    std::make_pair(":method", "get"),
+    std::make_pair(":path", "/"),
+    std::make_pair("cookie", "alpha"),
+    std::make_pair("cookie", "delta"),
+    std::make_pair("cookie", "echo"),
+    std::make_pair("cookie", "bravo"),
+    std::make_pair("cookie", "charlie")
+  };
+  CU_ASSERT(ans == d.get_request_headers());
+}
+
+void test_downstream_assemble_request_cookie(void)
+{
+  Downstream d(nullptr, 0, 0);
+  d.add_request_header(":method", "get");
+  d.add_request_header(":path", "/");
+  d.add_request_header("cookie", "alpha");
+  d.add_request_header("cookie", "bravo;");
+  d.add_request_header("cookie", "charlie; ");
+  d.add_request_header("cookie", "delta;;");
+  d.assemble_request_cookie();
+  CU_ASSERT("alpha; bravo; charlie; delta" ==
+            d.get_assembled_request_cookie());
+
+}
+
 } // namespace shrpx
diff --git a/src/shrpx_downstream_test.h b/src/shrpx_downstream_test.h
index 50e0b9f5..ef645578 100644
--- a/src/shrpx_downstream_test.h
+++ b/src/shrpx_downstream_test.h
@@ -31,6 +31,8 @@ void test_downstream_normalize_request_headers(void);
 void test_downstream_normalize_response_headers(void);
 void test_downstream_get_norm_request_header(void);
 void test_downstream_get_norm_response_header(void);
+void test_downstream_crumble_request_cookie(void);
+void test_downstream_assemble_request_cookie(void);
 
 } // namespace shrpx
 
diff --git a/src/shrpx_http2_downstream_connection.cc b/src/shrpx_http2_downstream_connection.cc
index 0ab95879..6c7d7cd6 100644
--- a/src/shrpx_http2_downstream_connection.cc
+++ b/src/shrpx_http2_downstream_connection.cc
@@ -228,6 +228,7 @@ int Http2DownstreamConnection::push_request_headers()
     return 0;
   }
   size_t nheader = downstream_->get_request_headers().size();
+  downstream_->crumble_request_cookie();
   downstream_->normalize_request_headers();
   auto end_headers = std::end(downstream_->get_request_headers());
   // 12 means:
diff --git a/src/shrpx_http_downstream_connection.cc b/src/shrpx_http_downstream_connection.cc
index e3cc2e08..f2641f52 100644
--- a/src/shrpx_http_downstream_connection.cc
+++ b/src/shrpx_http_downstream_connection.cc
@@ -116,6 +116,7 @@ int HttpDownstreamConnection::attach_downstream(Downstream *downstream)
 
 int HttpDownstreamConnection::push_request_headers()
 {
+  downstream_->assemble_request_cookie();
   downstream_->normalize_request_headers();
   auto end_headers = std::end(downstream_->get_request_headers());
   // Assume that method and request path do not contain \r\n.
@@ -152,6 +153,12 @@ int HttpDownstreamConnection::push_request_headers()
   http2::build_http1_headers_from_norm_headers
     (hdrs, downstream_->get_request_headers());
 
+  if(!downstream_->get_assembled_request_cookie().empty()) {
+    hdrs += "Cookie: ";
+    hdrs += downstream_->get_assembled_request_cookie();
+    hdrs += "\r\n";
+  }
+
   if(downstream_->get_request_connection_close()) {
     hdrs += "Connection: close\r\n";
   }