diff --git a/system/Config/Services.php b/system/Config/Services.php
index c0d5fcc392d2..61026de4292c 100644
--- a/system/Config/Services.php
+++ b/system/Config/Services.php
@@ -211,7 +211,7 @@ public static function curlrequest(array $options = [], ?ResponseInterface $resp
 
         return new CURLRequest(
             $config,
-            new URI($options['base_uri'] ?? null),
+            new URI($options['baseURI'] ?? null),
             $response,
             $options
         );
diff --git a/system/HTTP/ContentSecurityPolicy.php b/system/HTTP/ContentSecurityPolicy.php
index d0dda0ad5752..a6a2b26a71fc 100644
--- a/system/HTTP/ContentSecurityPolicy.php
+++ b/system/HTTP/ContentSecurityPolicy.php
@@ -356,9 +356,9 @@ public function reportOnly(bool $value = true)
     }
 
     /**
-     * Adds a new base_uri value. Can be either a URI class or a simple string.
+     * Adds a new baseURI value. Can be either a URI class or a simple string.
      *
-     * base_uri restricts the URLs that can appear in a page's <base> element.
+     * baseURI restricts the URLs that can appear in a page's <base> element.
      *
      * @see http://www.w3.org/TR/CSP/#directive-base-uri
      *
diff --git a/tests/system/HTTP/CURLRequestShareOptionsTest.php b/tests/system/HTTP/CURLRequestShareOptionsTest.php
index 38612ad03e05..8f6277cf9501 100644
--- a/tests/system/HTTP/CURLRequestShareOptionsTest.php
+++ b/tests/system/HTTP/CURLRequestShareOptionsTest.php
@@ -30,7 +30,7 @@ final class CURLRequestShareOptionsTest extends CURLRequestTest
 {
     protected function getRequest(array $options = []): MockCURLRequest
     {
-        $uri = isset($options['base_uri']) ? new URI($options['base_uri']) : new URI();
+        $uri = isset($options['baseURI']) ? new URI($options['baseURI']) : new URI();
         $app = new App();
 
         $config               = new ConfigCURLRequest();
@@ -43,7 +43,7 @@ protected function getRequest(array $options = []): MockCURLRequest
     public function testHeaderContentLengthNotSharedBetweenRequests(): void
     {
         $options = [
-            'base_uri' => 'http://www.foo.com/api/v1/',
+            'baseURI' => 'http://www.foo.com/api/v1/',
         ];
         $request = $this->getRequest($options);
 
@@ -61,8 +61,8 @@ public function testHeaderContentLengthNotSharedBetweenRequests(): void
     public function testBodyIsResetOnSecondRequest(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
         $request->setBody('name=George');
         $request->setOutput('Hi there');
diff --git a/tests/system/HTTP/CURLRequestTest.php b/tests/system/HTTP/CURLRequestTest.php
index df44c427a665..7c2d7b17138a 100644
--- a/tests/system/HTTP/CURLRequestTest.php
+++ b/tests/system/HTTP/CURLRequestTest.php
@@ -47,7 +47,7 @@ protected function setUp(): void
      */
     protected function getRequest(array $options = []): MockCURLRequest
     {
-        $uri = isset($options['base_uri']) ? new URI($options['base_uri']) : new URI();
+        $uri = isset($options['baseURI']) ? new URI($options['baseURI']) : new URI();
         $app = new App();
 
         $config               = new ConfigCURLRequest();
@@ -64,7 +64,7 @@ public function testPrepareURLIgnoresAppConfig(): void
     {
         config('App')->baseURL = 'http://example.com/fruit/';
 
-        $request = $this->getRequest(['base_uri' => 'http://example.com/v1/']);
+        $request = $this->getRequest(['baseURI' => 'http://example.com/v1/']);
 
         $method = $this->getPrivateMethodInvoker($request, 'prepareURL');
 
@@ -76,7 +76,7 @@ public function testPrepareURLIgnoresAppConfig(): void
      */
     public function testGetRemembersBaseURI(): void
     {
-        $request = $this->getRequest(['base_uri' => 'http://www.foo.com/api/v1/']);
+        $request = $this->getRequest(['baseURI' => 'http://www.foo.com/api/v1/']);
 
         $request->get('products');
 
@@ -90,7 +90,7 @@ public function testGetRemembersBaseURI(): void
      */
     public function testGetRemembersBaseURIWithHelperMethod(): void
     {
-        $request = Services::curlrequest(['base_uri' => 'http://www.foo.com/api/v1/']);
+        $request = Services::curlrequest(['baseURI' => 'http://www.foo.com/api/v1/']);
 
         $uri = $this->getPrivateProperty($request, 'baseURI');
         $this->assertSame('www.foo.com', $uri->getHost());
@@ -157,28 +157,17 @@ public function testOptionsSetsCorrectMethod(): void
 
     public function testOptionsBaseURIOption(): void
     {
-        $options = ['base_uri' => 'http://www.foo.com/api/v1/'];
+        $options = ['baseURI' => 'http://www.foo.com/api/v1/'];
         $request = $this->getRequest($options);
 
         $this->assertSame('http://www.foo.com/api/v1/', $request->getBaseURI()->__toString());
     }
 
-    public function testOptionsBaseURIOverride(): void
-    {
-        $options = [
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'baseURI'  => 'http://bogus/com',
-        ];
-        $request = $this->getRequest($options);
-
-        $this->assertSame('http://bogus/com', $request->getBaseURI()->__toString());
-    }
-
     public function testOptionsHeaders(): void
     {
         $options = [
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'headers'  => ['fruit' => 'apple'],
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'headers' => ['fruit' => 'apple'],
         ];
         $request = $this->getRequest();
         $this->assertNull($request->header('fruit'));
@@ -195,8 +184,8 @@ public function testOptionsHeadersNotUsingPopulate(): void
         $_SERVER['HTTP_ACCEPT_ENCODING'] = 'gzip, deflate, br';
 
         $options = [
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'headers'  => [
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'headers' => [
                 'Host'            => 'www.foo.com',
                 'Accept-Encoding' => '',
             ],
@@ -233,7 +222,7 @@ public function testDefaultOptionsAreSharedBetweenRequests(): void
     public function testHeaderContentLengthNotSharedBetweenRequests(): void
     {
         $options = [
-            'base_uri' => 'http://www.foo.com/api/v1/',
+            'baseURI' => 'http://www.foo.com/api/v1/',
         ];
         $request = $this->getRequest($options);
 
@@ -253,7 +242,7 @@ public function testHeaderContentLengthNotSharedBetweenClients(): void
         $_SERVER['HTTP_CONTENT_LENGTH'] = '10';
 
         $options = [
-            'base_uri' => 'http://www.foo.com/api/v1/',
+            'baseURI' => 'http://www.foo.com/api/v1/',
         ];
         $request = $this->getRequest($options);
         $request->post('example', [
@@ -730,8 +719,8 @@ public function testAllowRedirectsArray(): void
     public function testSendWithQuery(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'query'    => [
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'query'   => [
                 'name' => 'Henry',
                 'd.t'  => 'value',
             ],
@@ -747,8 +736,8 @@ public function testSendWithQuery(): void
     public function testSendWithDelay(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $request->get('products');
@@ -760,8 +749,8 @@ public function testSendWithDelay(): void
     public function testSendContinued(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $request->setOutput("HTTP/1.1 100 Continue\x0d\x0a\x0d\x0aHi there");
@@ -775,8 +764,8 @@ public function testSendContinued(): void
     public function testSendContinuedWithManyHeaders(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $output = "HTTP/1.1 100 Continue
@@ -819,8 +808,8 @@ public function testSendContinuedWithManyHeaders(): void
     public function testSendProxied(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $output = "HTTP/1.1 200 Connection established
@@ -834,8 +823,8 @@ public function testSendProxied(): void
     public function testSendProxiedWithHTTP10(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $output = "HTTP/1.0 200 Connection established
@@ -852,7 +841,7 @@ public function testSendProxiedWithHTTP10(): void
     public function testResponseHeadersWithMultipleRequests(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
+            'baseURI' => 'http://www.foo.com/api/v1/',
         ]);
 
         $output = "HTTP/2.0 200 OK
@@ -905,7 +894,7 @@ public function testResponseHeadersWithMultipleRequests(): void
     public function testResponseHeadersWithMultipleSetCookies(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'https://github.com/',
+            'baseURI' => 'https://github.com/',
         ]);
 
         $output = "HTTP/2 200
@@ -937,8 +926,8 @@ public function testResponseHeadersWithMultipleSetCookies(): void
     public function testSplitResponse(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $request->setOutput("Accept: text/html\x0d\x0a\x0d\x0aHi there");
@@ -949,8 +938,8 @@ public function testSplitResponse(): void
     public function testApplyBody(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $request->setBody('name=George');
@@ -964,8 +953,8 @@ public function testApplyBody(): void
     public function testApplyBodyByOptions(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $request->setOutput('Hi there');
@@ -980,8 +969,8 @@ public function testApplyBodyByOptions(): void
     public function testBodyIsResetOnSecondRequest(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
         $request->setBody('name=George');
         $request->setOutput('Hi there');
@@ -995,8 +984,8 @@ public function testBodyIsResetOnSecondRequest(): void
     public function testResponseHeaders(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $request->setOutput("HTTP/2.0 234 Ohoh\x0d\x0aAccept: text/html\x0d\x0a\x0d\x0aHi there");
@@ -1009,8 +998,8 @@ public function testResponseHeaders(): void
     public function testResponseHeadersShortProtocol(): void
     {
         $request = $this->getRequest([
-            'base_uri' => 'http://www.foo.com/api/v1/',
-            'delay'    => 100,
+            'baseURI' => 'http://www.foo.com/api/v1/',
+            'delay'   => 100,
         ]);
 
         $request->setOutput("HTTP/2 235 Ohoh\x0d\x0aAccept: text/html\x0d\x0a\x0d\x0aHi there shortie");