diff --git a/src/calibre/scraper/test_fetch_backend.py b/src/calibre/scraper/test_fetch_backend.py
index d0933a6559..6f4086365f 100644
--- a/src/calibre/scraper/test_fetch_backend.py
+++ b/src/calibre/scraper/test_fetch_backend.py
@@ -12,7 +12,6 @@ from lxml.html import fromstring, tostring
 
 from calibre.utils.resources import get_path as P
 
-from .qt import Browser
 from .simple import Overseer
 
 skip = ''
@@ -103,9 +102,20 @@ class TestFetchBackend(unittest.TestCase):
         self.server.shutdown()
         self.server_thread.join(5)
 
-    def test_recipe_browser(self):
+    def test_recipe_browser_qt(self):
+        from .qt import Browser
+        self.do_recipe_browser_test(Browser)
+
+    def test_recipe_browser_webengine(self):
+        from .qt import WebEngineBrowser
+        self.do_recipe_browser_test(WebEngineBrowser)
+
+    def do_recipe_browser_test(self, Browser):
         from urllib.error import URLError
         from urllib.request import Request
+
+        br = Browser(user_agent='test-ua', headers=(('th', '1'),), start_worker=True)
+
         def u(path=''):
             return f'http://localhost:{self.port}{path}'
 
@@ -134,7 +144,6 @@ class TestFetchBackend(unittest.TestCase):
             self.dont_send_body = False
             self.dont_send_response = False
 
-        br = Browser(user_agent='test-ua', headers=(('th', '1'),), start_worker=True)
         try:
             r = get()
             self.ae(r['request_count'], 1)
diff --git a/src/calibre/utils/certgen.c b/src/calibre/utils/certgen.c
index 642d8952d6..902cff3937 100644
--- a/src/calibre/utils/certgen.c
+++ b/src/calibre/utils/certgen.c
@@ -110,14 +110,16 @@ add_ext(STACK_OF(X509_EXTENSION) *sk, int nid, const char *value, char *item_typ
 static PyObject* create_rsa_cert_req(PyObject *self, PyObject *args) {
     PyObject *capsule = NULL, *ans = NULL, *t = NULL;
     X509_NAME *Name = NULL;
-    char *common_name = NULL, *country = NULL, *state = NULL, *locality = NULL, *org = NULL, *org_unit = NULL, *email = NULL, *basic_constraints = NULL, *digital_key_usage = NULL;
+    char *common_name = NULL, *country = NULL, *state = NULL, *locality = NULL, *org = NULL, *org_unit = NULL, *email = NULL, *basic_constraints = NULL, *digital_key_usage = NULL, *ext_key_usage = NULL;
     X509_REQ *Cert = NULL;
     PyObject *alt_names = NULL;
     int ok = 0, signature_length = 0;
     Py_ssize_t i = 0;
     STACK_OF(X509_EXTENSION) *exts = NULL;
 
-    if(!PyArg_ParseTuple(args, "OO!szzzzzzzz", &capsule, &PyTuple_Type, &alt_names, &common_name, &country, &state, &locality, &org, &org_unit, &email, &basic_constraints, &digital_key_usage)) return NULL;
+    if(!PyArg_ParseTuple(args, "OO!szzzzzzzzz",
+        &capsule, &PyTuple_Type, &alt_names, &common_name, &country, &state, &locality, &org, &org_unit, &email,
+        &basic_constraints, &digital_key_usage, &ext_key_usage)) return NULL;
     if(!PyCapsule_CheckExact(capsule)) return PyErr_Format(PyExc_TypeError, "The key is not a capsule object");
     EVP_PKEY *KeyPair = PyCapsule_GetPointer(capsule, NULL);
     if (!KeyPair) return PyErr_Format(PyExc_TypeError, "The key capsule is NULL");
@@ -150,6 +152,9 @@ static PyObject* create_rsa_cert_req(PyObject *self, PyObject *args) {
         if (digital_key_usage) {
             if(!add_ext(exts, NID_key_usage, digital_key_usage, "key_usage")) goto error;
         }
+        if (ext_key_usage) {
+            if(!add_ext(exts, NID_ext_key_usage, ext_key_usage, "key_usage")) goto error;
+        }
         X509_REQ_add_extensions(Cert, exts);
         sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
     }
@@ -374,6 +379,33 @@ error:
     return ans;
 }
 
+static PyObject*
+verify_cert(PyObject *self, PyObject *args) {
+    PyObject *ca_cert_cap, *cert_cap;
+    if(!PyArg_ParseTuple(args, "OO", &ca_cert_cap, &cert_cap)) return NULL;
+    if(!PyCapsule_CheckExact(ca_cert_cap)) return PyErr_Format(PyExc_TypeError, "The ca_cert is not a capsule object");
+    if(!PyCapsule_CheckExact(cert_cap)) return PyErr_Format(PyExc_TypeError, "The cert is not a capsule object");
+    X509 *ca_cert = PyCapsule_GetPointer(ca_cert_cap, NULL);
+    X509 *cert = PyCapsule_GetPointer(cert_cap, NULL);
+    X509_STORE *store = X509_STORE_new();
+    X509_STORE_add_cert(store, ca_cert);
+    X509_STORE_set_flags(store,
+        X509_V_FLAG_X509_STRICT | X509_V_FLAG_CHECK_SS_SIGNATURE |
+        X509_V_FLAG_POLICY_CHECK | X509_V_FLAG_EXPLICIT_POLICY |
+        X509_V_FLAG_NOTIFY_POLICY);
+    X509_STORE_CTX *vfy_ctx = X509_STORE_CTX_new();
+    X509_STORE_CTX_init(vfy_ctx, store, cert, NULL);
+    // X509_STORE_CTX_set_flags(vfy_ctx, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
+    int ok;
+    Py_BEGIN_ALLOW_THREADS
+    ok = X509_verify_cert(vfy_ctx);
+    Py_END_ALLOW_THREADS
+    X509_STORE_CTX_free(vfy_ctx);
+    X509_STORE_free(store);
+    if (!ok) { set_error("Verification failed"); return NULL; }
+    Py_RETURN_NONE;
+}
+
 static PyMethodDef certgen_methods[] = {
     {"create_rsa_keypair", create_rsa_keypair, METH_VARARGS,
         "create_rsa_keypair(size)\n\nCreate a RSA keypair of the specified size"
@@ -399,6 +431,10 @@ static PyMethodDef certgen_methods[] = {
         "cert_info(cert)\n\nReturn the certificate information (certificate in text format)"
     },
 
+    {"verify_cert", verify_cert, METH_VARARGS,
+        "verify_cert(cacert, cert)\n\nVerift cert against CA cert"
+    },
+
     {NULL, NULL, 0, NULL}
 };
 
diff --git a/src/calibre/utils/certgen.py b/src/calibre/utils/certgen.py
index d9905a4479..029bdb7a3a 100644
--- a/src/calibre/utils/certgen.py
+++ b/src/calibre/utils/certgen.py
@@ -16,11 +16,13 @@ def create_key_pair(size=2048):
 def create_cert_request(
     key_pair, common_name,
     country='IN', state='Maharashtra', locality='Mumbai', organization=None,
-    organizational_unit=None, email_address=None, alt_names=(), basic_constraints=None, digital_key_usage=None
+    organizational_unit=None, email_address=None, alt_names=(), basic_constraints=None,
+    digital_key_usage=None, ext_key_usage=None,
 ):
     return certgen.create_rsa_cert_req(
         key_pair, tuple(alt_names), common_name,
-        country, state, locality, organization, organizational_unit, email_address, basic_constraints, digital_key_usage
+        country, state, locality, organization, organizational_unit, email_address,
+        basic_constraints, digital_key_usage, ext_key_usage,
     )
 
 
@@ -66,12 +68,15 @@ def create_server_cert(
 
     # Create the Certificate Authority
     cakey = create_key_pair(key_size)
-    careq = create_cert_request(cakey, ca_name, basic_constraints='critical,CA:TRUE', digital_key_usage='critical,keyCertSign,cRLSign')
+    careq = create_cert_request(
+        cakey, ca_name, basic_constraints='critical,CA:TRUE', digital_key_usage='critical,keyCertSign,cRLSign')
     cacert = create_ca_cert(careq, cakey)
 
     # Create the server certificate issued by the newly created CA
     pkey = create_key_pair(key_size)
-    req = create_cert_request(pkey, domain_or_ip, country, state, locality, organization, organizational_unit, email_address, alt_names)
+    req = create_cert_request(
+        pkey, domain_or_ip, country, state, locality, organization, organizational_unit, email_address, alt_names,
+        ext_key_usage='critical,serverAuth')
     cert = create_cert(req, cacert, cakey, expire=expire)
 
     def export(dest, obj, func, *args):
@@ -92,24 +97,14 @@ def create_server_cert(
 
 
 def develop():
-    import subprocess
-    import tempfile
     cacert, cakey, cert, pkey = create_server_cert('test.me', alt_names=['DNS:moose.cat', 'DNS:huge.bat'])
     print("CA Certificate")
     print(cert_info(cacert))
     print(), print(), print()
     print('Server Certificate')
     print(cert_info(cert))
-    with tempfile.NamedTemporaryFile(prefix='CA-', suffix='.pem') as cafile, tempfile.NamedTemporaryFile(prefix='Server-', suffix='.crt') as certfile:
-        cafile.write(serialize_cert(cacert).encode())
-        certfile.write(serialize_cert(cert).encode())
-        cafile.flush()
-        certfile.flush()
-        # Verify the self signed certificate
-        subprocess.check_call(['openssl', 'verify', '-verbose', '-x509_strict', '-CAfile', cafile.name, cafile.name])
-        # Verify the server certificate signed with the self signed certificate
-        raise SystemExit(subprocess.run([
-            'openssl', 'verify', '-show_chain', '-no_check_time', '-verbose', '-x509_strict', '-CAfile', cafile.name, certfile.name]).returncode)
+    certgen.verify_cert(cacert, cacert)
+    certgen.verify_cert(cacert, cert)
 
 
 if __name__ == '__main__':