diff --git a/reg-tests/cache/caching_rules.vtc b/reg-tests/cache/caching_rules.vtc
index c20a720..114b2fd 100644
--- a/reg-tests/cache/caching_rules.vtc
+++ b/reg-tests/cache/caching_rules.vtc
@@ -78,6 +78,12 @@
 } -start
 
 haproxy h1 -conf {
+    global
+        # WT: limit false-positives causing "HTTP header incomplete" due to
+        # idle server connections being randomly used and randomly expiring
+        # under us.
+        tune.idle-pool.shared off
+
     defaults
         mode http
         ${no-htx} option http-use-htx
diff --git a/reg-tests/cache/expires.vtc b/reg-tests/cache/expires.vtc
index 51c7487..037f09f 100644
--- a/reg-tests/cache/expires.vtc
+++ b/reg-tests/cache/expires.vtc
@@ -40,6 +40,12 @@
 } -start
 
 haproxy h1 -conf {
+       global
+               # WT: limit false-positives causing "HTTP header incomplete" due to
+               # idle server connections being randomly used and randomly expiring
+               # under us.
+               tune.idle-pool.shared off
+
        defaults
                mode http
                ${no-htx} option http-use-htx
diff --git a/reg-tests/cache/if-modified-since.vtc b/reg-tests/cache/if-modified-since.vtc
index e491e46..8ae1cce 100644
--- a/reg-tests/cache/if-modified-since.vtc
+++ b/reg-tests/cache/if-modified-since.vtc
@@ -40,6 +40,12 @@
 } -start
 
 haproxy h1 -conf {
+       global
+               # WT: limit false-positives causing "HTTP header incomplete" due to
+               # idle server connections being randomly used and randomly expiring
+               # under us.
+               tune.idle-pool.shared off
+
        defaults
                mode http
                ${no-htx} option http-use-htx
diff --git a/reg-tests/cache/if-none-match.vtc b/reg-tests/cache/if-none-match.vtc
index c5391c9..ba3336a 100644
--- a/reg-tests/cache/if-none-match.vtc
+++ b/reg-tests/cache/if-none-match.vtc
@@ -25,6 +25,12 @@
 } -start
 
 haproxy h1 -conf {
+       global
+               # WT: limit false-positives causing "HTTP header incomplete" due to
+               # idle server connections being randomly used and randomly expiring
+               # under us.
+               tune.idle-pool.shared off
+
        defaults
                mode http
                ${no-htx} option http-use-htx
diff --git a/reg-tests/cache/sample_fetches.vtc b/reg-tests/cache/sample_fetches.vtc
index 73e6e1b..973b3ad 100644
--- a/reg-tests/cache/sample_fetches.vtc
+++ b/reg-tests/cache/sample_fetches.vtc
@@ -44,6 +44,12 @@
 } -start
 
 haproxy h1 -conf {
+    global
+        # WT: limit false-positives causing "HTTP header incomplete" due to
+        # idle server connections being randomly used and randomly expiring
+        # under us.
+        tune.idle-pool.shared off
+
     defaults
         mode http
         ${no-htx} option http-use-htx
diff --git a/reg-tests/cache/vary.vtc b/reg-tests/cache/vary.vtc
index f3425d0..0b5d139 100644
--- a/reg-tests/cache/vary.vtc
+++ b/reg-tests/cache/vary.vtc
@@ -127,6 +127,12 @@
 } -start
 
 haproxy h1 -conf {
+       global
+               # WT: limit false-positives causing "HTTP header incomplete" due to
+               # idle server connections being randomly used and randomly expiring
+               # under us.
+               tune.idle-pool.shared off
+
        defaults
                mode http
                ${no-htx} option http-use-htx
diff --git a/reg-tests/cache/vary_accept_encoding.vtc b/reg-tests/cache/vary_accept_encoding.vtc
index 185ad05..852ac29 100644
--- a/reg-tests/cache/vary_accept_encoding.vtc
+++ b/reg-tests/cache/vary_accept_encoding.vtc
@@ -92,6 +92,12 @@
 
 
 haproxy h1 -conf {
+       global
+               # WT: limit false-positives causing "HTTP header incomplete" due to
+               # idle server connections being randomly used and randomly expiring
+               # under us.
+               tune.idle-pool.shared off
+
        defaults
                mode http
                ${no-htx} option http-use-htx