--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -12,6 +12,8 @@
 
 static void ngx_http_read_client_request_body_handler(ngx_http_request_t *r);
 static ngx_int_t ngx_http_do_read_client_request_body(ngx_http_request_t *r);
+static ngx_int_t ngx_http_copy_pipelined_header(ngx_http_request_t *r,
+    ngx_buf_t *buf);
 static ngx_int_t ngx_http_write_request_body(ngx_http_request_t *r);
 static ngx_int_t ngx_http_read_discarded_request_body(ngx_http_request_t *r);
 static ngx_int_t ngx_http_discard_request_body_filter(ngx_http_request_t *r,
@@ -282,28 +284,12 @@ ngx_http_do_read_client_request_body(ngx
         for ( ;; ) {
             if (rb->buf->last == rb->buf->end) {
 
-                if (rb->buf->pos != rb->buf->last) {
-
-                    /* pass buffer to request body filter chain */
-
-                    out.buf = rb->buf;
-                    out.next = NULL;
-
-                    rc = ngx_http_request_body_filter(r, &out);
+                /* update chains */
 
-                    if (rc != NGX_OK) {
-                        return rc;
-                    }
-
-                } else {
+                rc = ngx_http_request_body_filter(r, NULL);
 
-                    /* update chains */
-
-                    rc = ngx_http_request_body_filter(r, NULL);
-
-                    if (rc != NGX_OK) {
-                        return rc;
-                    }
+                if (rc != NGX_OK) {
+                    return rc;
                 }
 
                 if (rb->busy != NULL) {
@@ -354,17 +340,15 @@ ngx_http_do_read_client_request_body(ngx
             rb->buf->last += n;
             r->request_length += n;
 
-            if (n == rest || n == 0) {
-                /* pass buffer to request body filter chain */
+            /* pass buffer to request body filter chain */
 
-                out.buf = rb->buf;
-                out.next = NULL;
+            out.buf = rb->buf;
+            out.next = NULL;
 
-                rc = ngx_http_request_body_filter(r, &out);
+            rc = ngx_http_request_body_filter(r, &out);
 
-                if (rc != NGX_OK) {
-                    return rc;
-                }
+            if (rc != NGX_OK) {
+                return rc;
             }
 
             if (rb->rest == 0) {
@@ -385,21 +369,6 @@ ngx_http_do_read_client_request_body(ngx
 
         if (!c->read->ready) {
 
-            if (r->request_body_no_buffering
-                && rb->buf->pos != rb->buf->last)
-            {
-                /* pass buffer to request body filter chain */
-
-                out.buf = rb->buf;
-                out.next = NULL;
-
-                rc = ngx_http_request_body_filter(r, &out);
-
-                if (rc != NGX_OK) {
-                    return rc;
-                }
-            }
-
             clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
             ngx_add_timer(c->read, clcf->client_body_timeout);
 
@@ -411,6 +380,10 @@ ngx_http_do_read_client_request_body(ngx
         }
     }
 
+    if (ngx_http_copy_pipelined_header(r, rb->buf) != NGX_OK) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
     if (c->read->timer_set) {
         ngx_del_timer(c->read);
     }
@@ -425,6 +398,88 @@ ngx_http_do_read_client_request_body(ngx
 
 
 static ngx_int_t
+ngx_http_copy_pipelined_header(ngx_http_request_t *r, ngx_buf_t *buf)
+{
+    size_t                     n;
+    ngx_buf_t                 *b;
+    ngx_chain_t               *cl;
+    ngx_http_connection_t     *hc;
+    ngx_http_core_srv_conf_t  *cscf;
+
+    b = r->header_in;
+    n = buf->last - buf->pos;
+
+    if (buf == b || n == 0) {
+        return NGX_OK;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "http body pipelined header: %uz", n);
+
+    /*
+     * if there is a pipelined request in the client body buffer,
+     * copy it to the r->header_in buffer if there is enough room,
+     * or allocate a large client header buffer
+     */
+
+    if (n > (size_t) (b->end - b->last)) {
+
+        hc = r->http_connection;
+
+        if (hc->free) {
+            cl = hc->free;
+            hc->free = cl->next;
+
+            b = cl->buf;
+
+            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                           "http large header free: %p %uz",
+                           b->pos, b->end - b->last);
+
+        } else {
+            cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
+
+            b = ngx_create_temp_buf(r->connection->pool,
+                                    cscf->large_client_header_buffers.size);
+            if (b == NULL) {
+                return NGX_ERROR;
+            }
+
+            cl = ngx_alloc_chain_link(r->connection->pool);
+            if (cl == NULL) {
+                return NGX_ERROR;
+            }
+
+            cl->buf = b;
+
+            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                           "http large header alloc: %p %uz",
+                           b->pos, b->end - b->last);
+        }
+
+        cl->next = hc->busy;
+        hc->busy = cl;
+        hc->nbusy++;
+
+        r->header_in = b;
+
+        if (n > (size_t) (b->end - b->last)) {
+            ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
+                          "too large pipelined header after reading body");
+            return NGX_ERROR;
+        }
+    }
+
+    ngx_memcpy(b->last, buf->pos, n);
+
+    b->last += n;
+    r->request_length -= n;
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
 ngx_http_write_request_body(ngx_http_request_t *r)
 {
     ssize_t                    n;
@@ -669,8 +724,7 @@ ngx_http_read_discarded_request_body(ngx
 
     for ( ;; ) {
         if (r->headers_in.content_length_n == 0) {
-            r->read_event_handler = ngx_http_block_reading;
-            return NGX_OK;
+            break;
         }
 
         if (!r->connection->read->ready) {
@@ -704,15 +758,24 @@ ngx_http_read_discarded_request_body(ngx
             return rc;
         }
     }
+
+    if (ngx_http_copy_pipelined_header(r, &b) != NGX_OK) {
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    r->read_event_handler = ngx_http_block_reading;
+
+    return NGX_OK;
 }
 
 
 static ngx_int_t
 ngx_http_discard_request_body_filter(ngx_http_request_t *r, ngx_buf_t *b)
 {
-    size_t                    size;
-    ngx_int_t                 rc;
-    ngx_http_request_body_t  *rb;
+    size_t                     size;
+    ngx_int_t                  rc;
+    ngx_http_request_body_t   *rb;
+    ngx_http_core_srv_conf_t  *cscf;
 
     if (r->headers_in.chunked) {
 
@@ -776,7 +839,10 @@ ngx_http_discard_request_body_filter(ngx
 
                 /* set amount of data we want to see next time */
 
-                r->headers_in.content_length_n = rb->chunked->length;
+                cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
+
+                r->headers_in.content_length_n = ngx_max(rb->chunked->length,
+                               (off_t) cscf->large_client_header_buffers.size);
                 break;
             }
 
@@ -945,6 +1011,7 @@ ngx_http_request_body_chunked_filter(ngx
     ngx_chain_t               *cl, *out, *tl, **ll;
     ngx_http_request_body_t   *rb;
     ngx_http_core_loc_conf_t  *clcf;
+    ngx_http_core_srv_conf_t  *cscf;
 
     rb = r->request_body;
 
@@ -958,17 +1025,16 @@ ngx_http_request_body_chunked_filter(ngx
             return NGX_HTTP_INTERNAL_SERVER_ERROR;
         }
 
+        cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
+
         r->headers_in.content_length_n = 0;
+        rb->rest = cscf->large_client_header_buffers.size;
 
 #if (NGX_HTTP_V3)
         if (r->http_version == NGX_HTTP_VERSION_30) {
             rb->rest = 1;
-
-        } else
+        }
 #endif
-        {
-            rb->rest = 3;
-        }
     }
 
     out = NULL;
@@ -976,6 +1042,8 @@ ngx_http_request_body_chunked_filter(ngx
 
     for (cl = in; cl; cl = cl->next) {
 
+        b = NULL;
+
         for ( ;; ) {
 
             ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0,
@@ -1019,6 +1087,29 @@ ngx_http_request_body_chunked_filter(ngx
                     return NGX_HTTP_REQUEST_ENTITY_TOO_LARGE;
                 }
 
+                if (b
+                    && rb->chunked->size <= 128
+                    && cl->buf->last - cl->buf->pos >= rb->chunked->size)
+                {
+                    r->headers_in.content_length_n += rb->chunked->size;
+
+                    if (rb->chunked->size < 8) {
+
+                        while (rb->chunked->size) {
+                            *b->last++ = *cl->buf->pos++;
+                            rb->chunked->size--;
+                        }
+
+                    } else {
+                        ngx_memmove(b->last, cl->buf->pos, rb->chunked->size);
+                        b->last += rb->chunked->size;
+                        cl->buf->pos += rb->chunked->size;
+                        rb->chunked->size = 0;
+                    }
+
+                    continue;
+                }
+
                 tl = ngx_chain_get_free_buf(r->pool, &rb->free);
                 if (tl == NULL) {
                     return NGX_HTTP_INTERNAL_SERVER_ERROR;
@@ -1084,7 +1175,10 @@ ngx_http_request_body_chunked_filter(ngx
 
                 /* set rb->rest, amount of data we want to see next time */
 
-                rb->rest = rb->chunked->length;
+                cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
+
+                rb->rest = ngx_max(rb->chunked->length,
+                               (off_t) cscf->large_client_header_buffers.size);
 
                 break;
             }