diff --git a/examples/protocols/esp_http_client/esp_http_client_test.py b/examples/protocols/esp_http_client/esp_http_client_test.py
index 0332ecc654..f27724535e 100644
--- a/examples/protocols/esp_http_client/esp_http_client_test.py
+++ b/examples/protocols/esp_http_client/esp_http_client_test.py
@@ -19,18 +19,19 @@ def test_examples_protocol_esp_http_client(env, extra_data):
     ttfw_idf.check_performance("esp_http_client_bin_size", bin_size // 1024, dut1.TARGET)
     # start test
     dut1.start_app()
-    dut1.expect("Connected to AP, begin http example", timeout=30)
-    dut1.expect(re.compile(r"HTTP GET Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP POST Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP PUT Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP PATCH Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP DELETE Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP HEAD Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP Basic Auth Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP Basic Auth redirect Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP Digest Auth Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTPS Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP chunk encoding Status = 200, content_length = (-?\d)"))
+    dut1.expect('Connected to AP, begin http example', timeout=30)
+    dut1.expect(re.compile(r'HTTP GET Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP POST Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP PUT Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP PATCH Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP DELETE Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP HEAD Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP Basic Auth Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP Basic Auth redirect Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP Digest Auth Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTPS Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTPS Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP chunk encoding Status = 200, content_length = (-?\d)'))
     # content-len for chunked encoding is typically -1, could be a positive length in some cases
     dut1.expect(re.compile(r"HTTP Stream reader Status = 200, content_length = (\d)"))
     dut1.expect(re.compile(r"Last esp error code: 0x8001"))
@@ -45,18 +46,19 @@ def test_examples_protocol_esp_http_client(env, extra_data):
     ttfw_idf.check_performance("esp_http_client_bin_size", bin_size // 1024, dut1.TARGET)
     # start test
     dut1.start_app()
-    dut1.expect("Connected to AP, begin http example", timeout=30)
-    dut1.expect(re.compile(r"HTTP GET Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP POST Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP PUT Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP PATCH Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP DELETE Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP HEAD Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP Basic Auth Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP Basic Auth redirect Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP Digest Auth Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTPS Status = 200, content_length = (\d)"))
-    dut1.expect(re.compile(r"HTTP chunk encoding Status = 200, content_length = (-?\d)"))
+    dut1.expect('Connected to AP, begin http example', timeout=30)
+    dut1.expect(re.compile(r'HTTP GET Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP POST Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP PUT Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP PATCH Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP DELETE Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP HEAD Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP Basic Auth Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP Basic Auth redirect Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP Digest Auth Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTPS Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTPS Status = 200, content_length = (\d)'))
+    dut1.expect(re.compile(r'HTTP chunk encoding Status = 200, content_length = (-?\d)'))
     # content-len for chunked encoding is typically -1, could be a positive length in some cases
     dut1.expect(re.compile(r"HTTP Stream reader Status = 200, content_length = (\d)"))
     dut1.expect(re.compile(r"Last esp error code: 0x8001"))
diff --git a/examples/protocols/esp_http_client/main/howsmyssl_com_root_cert.pem b/examples/protocols/esp_http_client/main/howsmyssl_com_root_cert.pem
index c7c077f91e..b85c8037f6 100644
--- a/examples/protocols/esp_http_client/main/howsmyssl_com_root_cert.pem
+++ b/examples/protocols/esp_http_client/main/howsmyssl_com_root_cert.pem
@@ -1,4 +1,4 @@
-----BEGIN CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
 MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
 TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
 cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMTUwNjA0MTEwNDM4