Support transmission of CONTINUATION, change nghttp2_frame_hd

The maximum frame size including header block is still limited
to NGHTTP2_HD_MAX_BUFFER_LENGTH, which is 32KB.

lib/includes/nghttp2/nghttp2.h

@@ -504,7 +504,11 @@ typedef struct {
   /**
    * The length field of this frame, excluding frame header.
    */
-  uint16_t length;
+  size_t length;
+  /**
+   * The stream identifier (aka, stream ID)
+   */
+  int32_t stream_id;
   /**
    * The type of this frame. See `nghttp2_frame`.
    */
@@ -513,10 +517,6 @@ typedef struct {
    * The flags.
    */
   uint8_t flags;
-  /**
-   * The stream identifier (aka, stream ID)
-   */
-  int32_t stream_id;
 } nghttp2_frame_hd;
 
 

lib/nghttp2_frame.c

@@ -230,7 +230,12 @@ ssize_t nghttp2_frame_pack_headers(uint8_t **buf_ptr,
     return rv;
   }
   framelen = rv + nv_offset;
-  frame->hd.length = framelen - NGHTTP2_FRAME_HEAD_LENGTH;
+  if(NGHTTP2_FRAME_HEAD_LENGTH + NGHTTP2_MAX_FRAME_LENGTH < rv + nv_offset) {
+    frame->hd.length = NGHTTP2_MAX_FRAME_LENGTH;
+    frame->hd.flags &= ~NGHTTP2_FLAG_END_HEADERS;
+  } else {
+    frame->hd.length = framelen - NGHTTP2_FRAME_HEAD_LENGTH;
+  }
   /* If frame->nvlen == 0, *buflen_ptr may be smaller than
      nv_offset */
   rv = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, nv_offset);
@@ -387,7 +392,12 @@ ssize_t nghttp2_frame_pack_push_promise(uint8_t **buf_ptr,
     return rv;
   }
   framelen = rv + nv_offset;
-  frame->hd.length = framelen - NGHTTP2_FRAME_HEAD_LENGTH;
+  if(NGHTTP2_FRAME_HEAD_LENGTH + NGHTTP2_MAX_FRAME_LENGTH < rv + nv_offset) {
+    frame->hd.length = NGHTTP2_MAX_FRAME_LENGTH;
+    frame->hd.flags &= ~NGHTTP2_FLAG_END_HEADERS;
+  } else {
+    frame->hd.length = framelen - NGHTTP2_FRAME_HEAD_LENGTH;
+  }
   /* If frame->nvlen == 0, *buflen_ptr may be smaller than
      nv_offset */
   rv = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, nv_offset);
@@ -562,8 +572,8 @@ ssize_t nghttp2_nv_array_copy(nghttp2_nv **nva_ptr,
   size_t buflen = 0;
   nghttp2_nv *p;
   for(i = 0; i < nvlen; ++i) {
-    if(nva[i].namelen > NGHTTP2_MAX_HD_VALUE_LENGTH ||
-       nva[i].valuelen > NGHTTP2_MAX_HD_VALUE_LENGTH) {
+    if(nva[i].namelen > NGHTTP2_HD_MAX_NAME ||
+       nva[i].valuelen > NGHTTP2_HD_MAX_VALUE) {
       return NGHTTP2_ERR_INVALID_ARGUMENT;
     }
     buflen += nva[i].namelen + nva[i].valuelen;

lib/nghttp2_frame.h

@@ -33,10 +33,6 @@
 #include "nghttp2_hd.h"
 #include "nghttp2_buffer.h"
 
-/* The maximum value length of name/value pair. This is not specified
-   by the spec. We just chose the arbitrary size */
-#define NGHTTP2_MAX_HD_VALUE_LENGTH ((1 << 13) - 1)
-
 #define NGHTTP2_FRAME_LENGTH_MASK ((1 << 14) - 1)
 #define NGHTTP2_STREAM_ID_MASK ((1u << 31) - 1)
 #define NGHTTP2_PRIORITY_MASK ((1u << 31) - 1)
@@ -99,7 +95,10 @@ size_t nghttp2_frame_headers_payload_nv_offset(nghttp2_headers *frame);
  * change.  |*buf_ptr| and |*buflen_ptr| are updated accordingly.
  *
  * frame->hd.length is assigned after length is determined during
- * packing process.
+ * packing process. If payload length is strictly larger than
+ * NGHTTP2_MAX_FRAME_LENGTH, payload data is still serialized as is,
+ * but frame->hd.length is set to NGHTTP2_MAX_FRAME_LENGTH and
+ * NGHTTP2_FLAG_END_HEADERS flag is cleared from frame->hd.flags.
  *
  * This function returns the size of packed frame if it succeeds, or
  * returns one of the following negative error codes:
@@ -242,7 +241,10 @@ int nghttp2_frame_unpack_settings_payload2(nghttp2_settings_entry **iv_ptr,
  * change.  |*buf_ptr| and |*buflen_ptr| are updated accordingly.
  *
  * frame->hd.length is assigned after length is determined during
- * packing process.
+ * packing process. If payload length is strictly larger than
+ * NGHTTP2_MAX_FRAME_LENGTH, payload data is still serialized as is,
+ * but frame->hd.length is set to NGHTTP2_MAX_FRAME_LENGTH and
+ * NGHTTP2_FLAG_END_HEADERS flag is cleared from frame->hd.flags.
  *
  * This function returns the size of packed frame if it succeeds, or
  * returns one of the following negative error codes:

lib/nghttp2_hd.c

@@ -443,9 +443,7 @@ static int ensure_write_buffer(uint8_t **buf_ptr, size_t *buflen_ptr,
                                size_t offset, size_t need)
 {
   int rv;
-  /* TODO Remove this limitation when header continuation is
-     implemented. */
-  if(need + offset > NGHTTP2_MAX_FRAME_LENGTH) {
+  if(need + offset > NGHTTP2_HD_MAX_BUFFER_LENGTH) {
     return NGHTTP2_ERR_HEADER_COMP;
   }
   rv = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, offset + need);

lib/nghttp2_hd.h

@@ -37,8 +37,11 @@
 #define NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE (1 << 12)
 #define NGHTTP2_HD_ENTRY_OVERHEAD 32
 
+/* The maximum value length of name/value pair. This is not specified
+   by the spec. We just chose the arbitrary size */
 #define NGHTTP2_HD_MAX_NAME 256
 #define NGHTTP2_HD_MAX_VALUE 4096
+#define NGHTTP2_HD_MAX_BUFFER_LENGTH (1 << 15)
 
 /* Default size of maximum table buffer size for encoder. Even if
    remote decoder notifies larger buffer size for its decoding,

lib/nghttp2_session.c

@@ -384,7 +384,7 @@ static void nghttp2_active_outbound_item_reset
   nghttp2_outbound_item_free(aob->item);
   free(aob->item);
   aob->item = NULL;
-  aob->framebuflen = aob->framebufoff = 0;
+  aob->framebuflen = aob->framebufoff = aob->framebufmark = 0;
 }
 
 void nghttp2_session_del(nghttp2_session *session)
@@ -1405,6 +1405,32 @@ static int nghttp2_session_after_frame_sent(nghttp2_session *session)
     int r;
     nghttp2_frame *frame;
     frame = nghttp2_outbound_item_get_ctrl_frame(session->aob.item);
+    if(frame->hd.type == NGHTTP2_HEADERS ||
+       frame->hd.type == NGHTTP2_PUSH_PROMISE) {
+      if(session->aob.framebufmark < session->aob.framebuflen) {
+        nghttp2_frame_hd cont_hd;
+        cont_hd.length = nghttp2_min(session->aob.framebuflen -
+                                     session->aob.framebufmark,
+                                     NGHTTP2_MAX_FRAME_LENGTH);
+        cont_hd.type = NGHTTP2_CONTINUATION;
+        if(cont_hd.length < NGHTTP2_MAX_FRAME_LENGTH) {
+          cont_hd.flags = NGHTTP2_FLAG_END_HEADERS;
+        } else {
+          cont_hd.flags = NGHTTP2_FLAG_NONE;
+        }
+        cont_hd.stream_id = frame->hd.stream_id;
+        nghttp2_frame_pack_frame_hd(session->aob.framebuf +
+                                    session->aob.framebufmark -
+                                    NGHTTP2_FRAME_HEAD_LENGTH,
+                                    &cont_hd);
+        session->aob.framebufmark += cont_hd.length;
+        session->aob.framebufoff -= NGHTTP2_FRAME_HEAD_LENGTH;
+        return 0;
+      }
+      /* Update frame payload length to include data sent in
+         CONTINUATION frame. */
+      frame->hd.length = session->aob.framebuflen - NGHTTP2_FRAME_HEAD_LENGTH;
+    }
     if(session->callbacks.on_frame_send_callback) {
       if(session->callbacks.on_frame_send_callback(session, frame,
                                                    session->user_data) != 0) {
@@ -1623,7 +1649,7 @@ static int nghttp2_session_after_frame_sent(nghttp2_session *session)
           nghttp2_active_outbound_item_reset(&session->aob);
           return r;
         } else {
-          session->aob.framebuflen = r;
+          session->aob.framebuflen = session->aob.framebufmark = r;
           session->aob.framebufoff = 0;
         }
       } else {
@@ -1666,7 +1692,8 @@ int nghttp2_session_send(nghttp2_session *session)
       framebuflen = nghttp2_session_prep_frame(session, item);
       if(framebuflen == NGHTTP2_ERR_DEFERRED) {
         continue;
-      } else if(framebuflen < 0) {
+      }
+      if(framebuflen < 0) {
         /* TODO If the error comes from compressor, the connection
            must be closed. */
         if(item->frame_cat == NGHTTP2_CAT_CTRL &&
@@ -1700,19 +1727,31 @@ int nghttp2_session_send(nghttp2_session *session)
       }
       session->aob.item = item;
       session->aob.framebuflen = framebuflen;
-      /* Call before_send callback */
-      if(item->frame_cat == NGHTTP2_CAT_CTRL &&
-         session->callbacks.before_frame_send_callback) {
-        if(session->callbacks.before_frame_send_callback
-           (session,
-            nghttp2_outbound_item_get_ctrl_frame(item),
-            session->user_data) != 0) {
-          return NGHTTP2_ERR_CALLBACK_FAILURE;
+
+      if(item->frame_cat == NGHTTP2_CAT_CTRL) {
+        nghttp2_frame *frame = nghttp2_outbound_item_get_ctrl_frame(item);
+        session->aob.framebufmark =
+          frame->hd.length + NGHTTP2_FRAME_HEAD_LENGTH;
+        /* Call before_send callback */
+        if(session->callbacks.before_frame_send_callback) {
+          size_t origlen = frame->hd.length;
+          frame->hd.length =
+            session->aob.framebuflen - NGHTTP2_FRAME_HEAD_LENGTH;
+          r = session->callbacks.before_frame_send_callback
+            (session, frame, session->user_data);
+          frame->hd.length = origlen;
+          if(r != 0) {
+            return NGHTTP2_ERR_CALLBACK_FAILURE;
+          }
         }
+      } else {
+        session->aob.framebufmark =
+          nghttp2_outbound_item_get_data_frame
+          (session->aob.item)->hd.length + NGHTTP2_FRAME_HEAD_LENGTH;
       }
     }
     data = session->aob.framebuf + session->aob.framebufoff;
-    datalen = session->aob.framebuflen - session->aob.framebufoff;
+    datalen = session->aob.framebufmark - session->aob.framebufoff;
     sentlen = session->callbacks.send_callback(session, data, datalen, 0,
                                                session->user_data);
     if(sentlen < 0) {
@@ -1742,7 +1781,7 @@ int nghttp2_session_send(nghttp2_session *session)
         }
       }
       session->aob.framebufoff += sentlen;
-      if(session->aob.framebufoff == session->aob.framebuflen) {
+      if(session->aob.framebufoff == session->aob.framebufmark) {
         /* Frame has completely sent */
         r = nghttp2_session_after_frame_sent(session);
         if(r < 0) {
@@ -1823,6 +1862,8 @@ static int session_call_on_end_headers
 (nghttp2_session *session, nghttp2_frame *frame, nghttp2_error_code error_code)
 {
   int rv;
+  DEBUGF(fprintf(stderr, "Call on_end_headers callback stream_id=%d\n",
+                 frame->hd.stream_id));
   if(session->callbacks.on_end_headers_callback) {
     rv = session->callbacks.on_end_headers_callback(session, frame, error_code,
                                                     session->user_data);
@@ -2167,11 +2208,6 @@ int nghttp2_session_on_request_headers_received(nghttp2_session *session,
     return nghttp2_session_inflate_handle_invalid_connection
       (session, frame, NGHTTP2_PROTOCOL_ERROR);
   }
-  /* Connection error if header continuation is employed for now */
-  if((frame->hd.flags & NGHTTP2_FLAG_END_HEADERS) == 0) {
-    return nghttp2_session_inflate_handle_invalid_connection
-      (session, frame, NGHTTP2_INTERNAL_ERROR);
-  }
   if(session->goaway_flags) {
     /* We don't accept new stream after GOAWAY is sent or received. */
     return NGHTTP2_ERR_IGN_HEADER_BLOCK;
@@ -2222,11 +2258,6 @@ int nghttp2_session_on_response_headers_received(nghttp2_session *session,
     return nghttp2_session_inflate_handle_invalid_connection
       (session, frame, NGHTTP2_PROTOCOL_ERROR);
   }
-  /* Connection error if header continuation is employed for now */
-  if((frame->hd.flags & NGHTTP2_FLAG_END_HEADERS) == 0) {
-    return nghttp2_session_inflate_handle_invalid_connection
-      (session, frame, NGHTTP2_INTERNAL_ERROR);
-  }
   if(stream->shut_flags & NGHTTP2_SHUT_RD) {
     /* half closed (remote): from the spec:
 
@@ -2255,11 +2286,6 @@ int nghttp2_session_on_push_response_headers_received(nghttp2_session *session,
     return nghttp2_session_inflate_handle_invalid_connection
       (session, frame, NGHTTP2_PROTOCOL_ERROR);
   }
-  /* Connection error if header continuation is employed for now */
-  if((frame->hd.flags & NGHTTP2_FLAG_END_HEADERS) == 0) {
-    return nghttp2_session_inflate_handle_invalid_connection
-      (session, frame, NGHTTP2_INTERNAL_ERROR);
-  }
   if(session->goaway_flags) {
     /* We don't accept new stream after GOAWAY is sent or received. */
     return NGHTTP2_ERR_IGN_HEADER_BLOCK;
@@ -2286,11 +2312,6 @@ int nghttp2_session_on_headers_received(nghttp2_session *session,
     return nghttp2_session_inflate_handle_invalid_connection
       (session, frame, NGHTTP2_PROTOCOL_ERROR);
   }
-  /* Connection error if header continuation is employed for now */
-  if((frame->hd.flags & NGHTTP2_FLAG_END_HEADERS) == 0) {
-    return nghttp2_session_inflate_handle_invalid_connection
-      (session, frame, NGHTTP2_INTERNAL_ERROR);
-  }
   if(stream->state == NGHTTP2_STREAM_RESERVED) {
     /* reserved. The valid push response HEADERS is processed by
        nghttp2_session_on_push_response_headers_received(). This
@@ -2848,11 +2869,6 @@ int nghttp2_session_on_push_promise_received(nghttp2_session *session,
     return nghttp2_session_inflate_handle_invalid_connection
       (session, frame, NGHTTP2_PROTOCOL_ERROR);
   }
-  /* Connection error if header continuation is employed for now */
-  if((frame->hd.flags & NGHTTP2_FLAG_END_PUSH_PROMISE) == 0) {
-    return nghttp2_session_inflate_handle_invalid_connection
-      (session, frame, NGHTTP2_INTERNAL_ERROR);
-  }
   if(session->local_settings[NGHTTP2_SETTINGS_ENABLE_PUSH] == 0) {
     return nghttp2_session_inflate_handle_invalid_connection
       (session, frame, NGHTTP2_PROTOCOL_ERROR);
@@ -3601,6 +3617,10 @@ ssize_t nghttp2_session_mem_recv(nghttp2_session *session,
       readlen = inbound_frame_payload_readlen(iframe, in, last);
       DEBUGF(fprintf(stderr, "readlen=%zu, payloadleft=%zu\n",
                      readlen, iframe->payloadleft));
+      DEBUGF(fprintf(stderr, "block final=%d\n",
+                     (iframe->frame.hd.flags &
+                      NGHTTP2_FLAG_END_HEADERS) &&
+                     iframe->payloadleft == readlen));
       rv = inflate_header_block(session, &iframe->frame, &readlen,
                                 (uint8_t*)in, readlen,
                                 (iframe->frame.hd.flags &
@@ -3730,6 +3750,10 @@ ssize_t nghttp2_session_mem_recv(nghttp2_session *session,
       iframe->payloadleft = cont_hd.length;
       if(cont_hd.type != NGHTTP2_CONTINUATION ||
          cont_hd.stream_id != iframe->frame.hd.stream_id) {
+        DEBUGF(fprintf(stderr, "expected stream_id=%d, type=%d, but "
+                       "got stream_id=%d, type=%d\n",
+                       iframe->frame.hd.stream_id, NGHTTP2_CONTINUATION,
+                       cont_hd.stream_id, cont_hd.type));
         rv = nghttp2_session_terminate_session(session,
                                                NGHTTP2_PROTOCOL_ERROR);
         if(nghttp2_is_fatal(rv)) {
@@ -4024,6 +4048,7 @@ ssize_t nghttp2_session_pack_data(nghttp2_session *session,
     /* This is the error code when callback is failed. */
     return NGHTTP2_ERR_CALLBACK_FAILURE;
   }
+  frame->hd.length = r;
   memset(*buf_ptr, 0, NGHTTP2_FRAME_HEAD_LENGTH);
   nghttp2_put_uint16be(&(*buf_ptr)[0], r);
   flags = 0;

lib/nghttp2_session.h

@@ -60,6 +60,9 @@ typedef struct {
   size_t framebuflen;
   /* The number of bytes has been sent */
   size_t framebufoff;
+  /* Marks the last position to send. This is used to implement
+     CONTINUATION */
+  size_t framebufmark;
 } nghttp2_active_outbound_item;
 
 /* Buffer length for inbound raw byte stream. */

src/app_helper.cc

@@ -438,7 +438,7 @@ void print_data_frame(print_type ptype, uint16_t length, uint8_t flags,
 {
   printf("%sDATA%s frame ",
          frame_name_ansi_esc(ptype), ansi_escend());
-  nghttp2_frame_hd hd = {length, NGHTTP2_DATA, flags, stream_id};
+  nghttp2_frame_hd hd = {length, stream_id, NGHTTP2_DATA, flags};
   print_frame_hd(hd);
   if(flags) {
     print_frame_attr_indent();

tests/main.c

@@ -144,6 +144,8 @@ int main(int argc, char* argv[])
       !CU_add_test(pSuite, "submit_headers_push_reply",
                    test_nghttp2_submit_headers_push_reply) ||
       !CU_add_test(pSuite, "submit_headers", test_nghttp2_submit_headers) ||
+      !CU_add_test(pSuite, "submit_headers_continuation",
+                   test_nghttp2_submit_headers_continuation) ||
       !CU_add_test(pSuite, "submit_priority", test_nghttp2_submit_priority) ||
       !CU_add_test(pSuite, "session_submit_settings",
                    test_nghttp2_submit_settings) ||

tests/nghttp2_frame_test.c

@@ -143,8 +143,8 @@ void test_nghttp2_frame_pack_headers_frame_too_large(void)
   ssize_t framelen;
   nghttp2_nv *nva;
   ssize_t nvlen;
-  size_t big_vallen = NGHTTP2_MAX_HD_VALUE_LENGTH;
-  nghttp2_nv big_hds[8];
+  size_t big_vallen = NGHTTP2_HD_MAX_VALUE;
+  nghttp2_nv big_hds[16];
   size_t big_hdslen = ARRLEN(big_hds);
   size_t i;
 

tests/nghttp2_session_test.c

@@ -734,7 +734,7 @@ void test_nghttp2_session_recv_continuation(void)
 
   ud.header_cb_called = 0;
   rv = nghttp2_session_mem_recv(session, data, datalen);
-  CU_ASSERT(rv == datalen);
+  CU_ASSERT((ssize_t)datalen == rv);
   CU_ASSERT(2 == ud.header_cb_called);
 
   nghttp2_hd_deflate_free(&deflater);
@@ -765,7 +765,7 @@ void test_nghttp2_session_recv_continuation(void)
 
   ud.end_headers_cb_called = 0;
   rv = nghttp2_session_mem_recv(session, data, datalen);
-  CU_ASSERT(datalen == rv);
+  CU_ASSERT((ssize_t)datalen == rv);
 
   CU_ASSERT(1 == ud.end_headers_cb_called);
   CU_ASSERT(NGHTTP2_GOAWAY ==
@@ -847,7 +847,8 @@ void test_nghttp2_session_continue(void)
 
   recv_frame = user_data.frame;
   CU_ASSERT(NGHTTP2_HEADERS == recv_frame->hd.type);
-  CU_ASSERT(framelen1 - NGHTTP2_FRAME_HEAD_LENGTH == recv_frame->hd.length);
+  CU_ASSERT((size_t)framelen1 - NGHTTP2_FRAME_HEAD_LENGTH ==
+            recv_frame->hd.length);
 
   CU_ASSERT(1 == user_data.header_cb_called);
   CU_ASSERT(0 == user_data.end_headers_cb_called);
@@ -877,7 +878,8 @@ void test_nghttp2_session_continue(void)
 
   recv_frame = user_data.frame;
   CU_ASSERT(NGHTTP2_HEADERS == recv_frame->hd.type);
-  CU_ASSERT(framelen2 - NGHTTP2_FRAME_HEAD_LENGTH == recv_frame->hd.length);
+  CU_ASSERT((size_t)framelen2 - NGHTTP2_FRAME_HEAD_LENGTH ==
+            recv_frame->hd.length);
 
   CU_ASSERT(1 == user_data.header_cb_called);
   CU_ASSERT(1 == user_data.end_headers_cb_called);
@@ -1801,7 +1803,6 @@ void test_nghttp2_session_send_headers_reply(void)
   nghttp2_session_del(session);
 }
 
-/* TODO Rewrite this test when header continuation is supported */
 void test_nghttp2_session_send_headers_header_comp_error(void)
 {
   nghttp2_session *session;
@@ -1809,8 +1810,8 @@ void test_nghttp2_session_send_headers_header_comp_error(void)
   nghttp2_frame *frame = malloc(sizeof(nghttp2_frame));
   nghttp2_nv *nva;
   ssize_t nvlen;
-  size_t vallen = NGHTTP2_MAX_HD_VALUE_LENGTH;
-  nghttp2_nv nv[8];
+  size_t vallen = NGHTTP2_HD_MAX_VALUE;
+  nghttp2_nv nv[16];
   size_t nnv = ARRLEN(nv);
   size_t i;
 
@@ -2455,6 +2456,52 @@ void test_nghttp2_submit_headers(void)
   nghttp2_session_del(session);
 }
 
+void test_nghttp2_submit_headers_continuation(void)
+{
+  nghttp2_session *session;
+  nghttp2_session_callbacks callbacks;
+  nghttp2_nv nv[] = {
+    MAKE_NV("h1", ""),
+    MAKE_NV("h1", ""),
+    MAKE_NV("h1", ""),
+    MAKE_NV("h1", ""),
+    MAKE_NV("h1", ""),
+    MAKE_NV("h1", ""),
+    MAKE_NV("h1", ""),
+  };
+  nghttp2_outbound_item *item;
+  uint8_t data[4096];
+  size_t i;
+  my_user_data ud;
+
+  memset(data, '0', sizeof(data));
+  for(i = 0; i < ARRLEN(nv); ++i) {
+    nv[i].valuelen = sizeof(data);
+    nv[i].value = data;
+  }
+
+  memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
+  callbacks.send_callback = null_send_callback;
+  callbacks.on_frame_send_callback = on_frame_send_callback;
+
+  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  CU_ASSERT(0 == nghttp2_submit_headers(session,
+                                        NGHTTP2_FLAG_END_STREAM,
+                                        -1, NGHTTP2_PRI_DEFAULT,
+                                        nv, ARRLEN(nv), NULL));
+  item = nghttp2_session_get_next_ob_item(session);
+  CU_ASSERT(NGHTTP2_HEADERS == OB_CTRL_TYPE(item));
+  CU_ASSERT((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS) ==
+            OB_CTRL(item)->hd.flags);
+  CU_ASSERT(NGHTTP2_PRI_DEFAULT == OB_CTRL(item)->headers.pri);
+
+  ud.frame_send_cb_called = 0;
+  CU_ASSERT(0 == nghttp2_session_send(session));
+  CU_ASSERT(1 == ud.frame_send_cb_called);
+
+  nghttp2_session_del(session);
+}
+
 void test_nghttp2_submit_priority(void)
 {
   nghttp2_session *session;

tests/nghttp2_session_test.h

@@ -62,6 +62,7 @@ void test_nghttp2_submit_headers_start_stream(void);
 void test_nghttp2_submit_headers_reply(void);
 void test_nghttp2_submit_headers_push_reply(void);
 void test_nghttp2_submit_headers(void);
+void test_nghttp2_submit_headers_continuation(void);
 void test_nghttp2_submit_priority(void);
 void test_nghttp2_submit_settings(void);
 void test_nghttp2_submit_settings_update_local_window_size(void);