diff --git a/CHANGES b/CHANGES
index eabbeefc54..4b41aeae4d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2,6 +2,10 @@
 
 Changes with Apache 2.4.7
 
+  *) ab: Add a new -l parameter in order not to check the length of the responses.
+     This can be usefull with dynamic pages.
+     PR9945, PR27888, PR42040 [<ccikrs1 cranbrook edu>]
+     
   *) Suppress formatting of startup messages written to the console when
      ErrorLogFormat is used.  [Jeff Trawick]
 
diff --git a/docs/manual/programs/ab.xml b/docs/manual/programs/ab.xml
index 660fd4737a..640b132193 100644
--- a/docs/manual/programs/ab.xml
+++ b/docs/manual/programs/ab.xml
@@ -49,6 +49,7 @@
     [ -<strong>H</strong> <var>custom-header</var> ]
     [ -<strong>i</strong> ]
     [ -<strong>k</strong> ]
+    [ -<strong>l</strong> ]
     [ -<strong>n</strong> <var>requests</var> ]
     [ -<strong>p</strong> <var>POST-file</var> ]
     [ -<strong>P</strong> <var>proxy-auth-username</var>:<var>password</var> ]
@@ -127,6 +128,11 @@
     <dd>Enable the HTTP KeepAlive feature, <em>i.e.</em>, perform multiple
     requests within one HTTP session. Default is no KeepAlive.</dd>
 
+    <dt><code>-l</code></dt>
+    <dd>Do not report errors if the length of the responses is not constant. This 
+    can be usefull for dynamic pages.
+    </dd>
+
     <dt><code>-n <var>requests</var></code></dt>
     <dd>Number of requests to perform for the benchmarking session. The default
     is to just perform a single request which usually leads to
diff --git a/support/ab.c b/support/ab.c
index dca3199afc..97cf7044e6 100644
--- a/support/ab.c
+++ b/support/ab.c
@@ -273,6 +273,7 @@ int requests = 1;       /* Number of requests to make */
 int heartbeatres = 100; /* How often do we say we're alive */
 int concurrency = 1;    /* Number of multiple requests to make */
 int percentile = 1;     /* Show percentile served */
+int nolength = 0;		/* Accept variable document length */
 int confidence = 1;     /* Show confidence estimator and warnings */
 int tlimit = 0;         /* time limit in secs */
 int keepalive = 0;      /* try and do keepalive connections */
@@ -781,7 +782,10 @@ static void output_results(int sig)
 #endif
     printf("\n");
     printf("Document Path:          %s\n", path);
-    printf("Document Length:        %" APR_SIZE_T_FMT " bytes\n", doclen);
+    if (nolength)
+        printf("Document Length:        Variable\n");
+    else
+        printf("Document Length:        %" APR_SIZE_T_FMT " bytes\n", doclen);
     printf("\n");
     printf("Concurrency Level:      %d\n", concurrency);
     printf("Time taken for tests:   %.3f seconds\n", timetaken);
@@ -1053,9 +1057,14 @@ static void output_html_results(void)
     printf("<tr %s><th colspan=2 %s>Document Path:</th>"
        "<td colspan=2 %s>%s</td></tr>\n",
        trstring, tdstring, tdstring, path);
-    printf("<tr %s><th colspan=2 %s>Document Length:</th>"
-       "<td colspan=2 %s>%" APR_SIZE_T_FMT " bytes</td></tr>\n",
-       trstring, tdstring, tdstring, doclen);
+    if (nolength)
+        printf("<tr %s><th colspan=2 %s>Document Length:</th>"
+            "<td colspan=2 %s>Variable</td></tr>\n",
+            trstring, tdstring, tdstring);
+    else
+        printf("<tr %s><th colspan=2 %s>Document Length:</th>"
+            "<td colspan=2 %s>%" APR_SIZE_T_FMT " bytes</td></tr>\n",
+            trstring, tdstring, tdstring, doclen);
     printf("<tr %s><th colspan=2 %s>Concurrency Level:</th>"
        "<td colspan=2 %s>%d</td></tr>\n",
        trstring, tdstring, tdstring, concurrency);
@@ -1293,7 +1302,7 @@ static void close_connection(struct connection * c)
             /* first time here */
             doclen = c->bread;
         }
-        else if (c->bread != doclen) {
+        else if ((c->bread != doclen) && !nolength) {
             bad++;
             err_length++;
         }
@@ -1537,7 +1546,7 @@ static void read_connection(struct connection * c)
             /* first time here */
             doclen = c->bread;
         }
-        else if (c->bread != doclen) {
+        else if ((c->bread != doclen) && !nolength) {
             bad++;
             err_length++;
         }
@@ -1901,6 +1910,7 @@ static void usage(const char *progname)
     fprintf(stderr, "    -d              Do not show percentiles served table.\n");
     fprintf(stderr, "    -S              Do not show confidence estimators and warnings.\n");
     fprintf(stderr, "    -q              Do not show progress when doing more than 150 requests\n");
+    fprintf(stderr, "    -l              Accept variable document length (use this for dynamic pages)\n");
     fprintf(stderr, "    -g filename     Output collected data to gnuplot format file.\n");
     fprintf(stderr, "    -e filename     Output CSV file with percentages served\n");
     fprintf(stderr, "    -r              Don't exit on socket receive errors.\n");
@@ -2085,7 +2095,7 @@ int main(int argc, const char * const argv[])
     myhost = NULL; /* 0.0.0.0 or :: */
 
     apr_getopt_init(&opt, cntxt, argc, argv);
-    while ((status = apr_getopt(opt, "n:c:t:s:b:T:p:u:v:rkVhwix:y:z:C:H:P:A:g:X:de:SqB:"
+    while ((status = apr_getopt(opt, "n:c:t:s:b:T:p:u:v:lrkVhwix:y:z:C:H:P:A:g:X:de:SqB:"
 #ifdef USE_SSL
             "Z:f:"
 #endif
@@ -2147,6 +2157,9 @@ int main(int argc, const char * const argv[])
                 method = PUT;
                 send_body = 1;
                 break;
+            case 'l':
+                nolength = 1;
+                break;
             case 'r':
                 recverrok = 1;
                 break;