diff --git a/src/Protocols/Http.php b/src/Protocols/Http.php
index 60083386..63cde7b4 100644
--- a/src/Protocols/Http.php
+++ b/src/Protocols/Http.php
@@ -142,7 +142,7 @@ public static function input(string $buffer, TcpConnection $connection): int
             // Disallow duplicate Content-Length headers (adjacent or separated)
             . '(?![\s\S]*\r\nContent-Length[ \t]*:[^\r\n]*\r\n(?:[\s\S]*?\r\n)?Content-Length[ \t]*:)'
             // Match request line: METHOD SP request-target SP HTTP-version CRLF
-            . '(?:(?-i:GET|POST|OPTIONS|HEAD|DELETE|PUT|PATCH) )+(?:/[^\x00-\x20\x7f]*)+(?: (?-i:HTTP)/1.[0-9])\r\n'
+            . '(?:(?-i:GET|POST|OPTIONS|HEAD|DELETE|PUT|PATCH) )+(?:(http|https):/)*(?:/[^\x00-\x20\x7f]*)+(?: (?-i:HTTP)/1.[0-9])\r\n'
             // Flag case-insensitive
             . '~i';
 
diff --git a/tests/Unit/Protocols/HttpTest.php b/tests/Unit/Protocols/HttpTest.php
index 41ff2874..34659bf7 100644
--- a/tests/Unit/Protocols/HttpTest.php
+++ b/tests/Unit/Protocols/HttpTest.php
@@ -135,6 +135,26 @@
         "GET / HTTP/1.2\r\n\r\n",
         18, // strlen("GET / HTTP/1.2\r\n\r\n")
     ],
+    'allow full url in request-target (compatibility)' => [
+        "GET http://example.com/ HTTP/1.1\r\n\r\n",
+        strlen("GET http://example.com/ HTTP/1.1\r\n\r\n"),
+    ],
+    'allow full url with port in request-target (compatibility)' => [
+        "GET http://example.com:8080/ HTTP/1.1\r\n\r\n",
+        strlen("GET http://example.com:8080/ HTTP/1.1\r\n\r\n"),
+    ],
+    'allow full url with query in request-target (compatibility)' => [
+        "GET http://example.com/search?q=workerman HTTP/1.1\r\n\r\n",
+        strlen("GET http://example.com/search?q=workerman HTTP/1.1\r\n\r\n"),
+    ],
+    'allow full url with uppercase scheme in request-target (compatibility)' => [
+        "GET HTTP://example.com/ HTTP/1.1\r\n\r\n",
+        strlen("GET HTTP://example.com/ HTTP/1.1\r\n\r\n"),
+    ],
+    'allow full url with path in request-target (compatibility)' => [
+        "GET https://example.com/foo/bar HTTP/1.1\r\n\r\n",
+        strlen("GET https://example.com/foo/bar HTTP/1.1\r\n\r\n"),
+    ],
 ]);
 
 it('rejects invalid request-line cases in ::input', function (string $buffer) {
@@ -151,9 +171,6 @@
     'leading whitespace before method is not allowed' => [
         " GET / HTTP/1.1\r\n\r\n",
     ],
-    'absolute-form request-target is not supported' => [
-        "GET http://example.com/ HTTP/1.1\r\n\r\n",
-    ],
     'asterisk-form request-target is not supported (including OPTIONS *)' => [
         "OPTIONS * HTTP/1.1\r\n\r\n",
     ],
@@ -187,6 +204,66 @@
     'space after version is not allowed' => [
         "GET / http/1.1 \r\n\r\n",
     ],
+    'missing space between method and path' => [
+        "GET/ HTTP/1.1\r\n\r\n",
+    ],
+    'missing space between path and version' => [
+        "GET /HTTP/1.1\r\n\r\n",
+    ],
+    'missing version' => [
+        "GET / \r\n\r\n",
+    ],
+    'missing path' => [
+        "GET  HTTP/1.1\r\n\r\n",
+    ],
+    'missing method' => [
+        " / HTTP/1.1\r\n\r\n",
+    ],
+    'empty request-line' => [
+        "\r\n\r\n",
+    ],
+    'bad scheme' => [
+        "GET ftp://example.com/ HTTP/1.1\r\nHost: example.com\r\n\r\n",
+    ],
+    'bad authority in absolute-form request-target' => [
+        "GET http://exa mple.com/ HTTP/1.1\r\n\r\n",
+    ],
+    'bad path in absolute-form request-target' => [
+        "GET http://example.com/fo o HTTP/1.1\r\n\r\n",
+    ],
+    'bad query in absolute-form request-target' => [
+        "GET http://example.com/search?q=wor k HTTP/1.1\r\n\r\n",
+    ],
+    'bad fragment in absolute-form request-target' => [
+        "GET http://example.com/#frag ment HTTP/1.1\r\n\r\n",
+    ],
+    'bad port in absolute-form request-target' => [
+         "GET http://example.com:80 80/ HTTP/1.1\r\n\r\n",
+     ],
+    // 'bad port number in absolute-form request-target' => [
+    //     "GET http://example.com:abc/ HTTP/1.1\r\n\r\n",
+    // ],
+    // 'bad port number in absolute-form request-target (too large)' => [
+    //     "GET http://example.com:99999/ HTTP/1.1\r\n\r\n",
+    // ],
+    // 'bad port number in absolute-form request-target (negative)' => [
+    //     "GET http://example.com:-80/ HTTP/1.1\r\n\r\n",
+    // ],
+    // 'bad port number in absolute-form request-target (non-digit characters)' => [
+    //     "GET http://example.com:8o80/ HTTP/1.1\r\n\r\n",
+    // ],
+    // 'bad port number in absolute-form request-target (empty)' => [
+    //     "GET http://example.com:/ HTTP/1.1\r\n\r\n",
+    // ],
+    // 'bad port number in absolute-form request-target (leading zero)' => [
+    //     "GET http://example.com:080/ HTTP/1.1\r\n\r\n",
+    // ],
+    'bad full url in request-target (invalid characters in host)' => [
+        "GET http://exa mple.com/ HTTP/1.1\r\n\r\n",
+    ],
+    'bad full url in request-target' => [
+        "GET htp://example.com/foo HTTP/1.1\r\n\r\n",
+    ],
 
 ]);