ServerRequest does not include empty Content-type and -length headers

src/Message/ServerRequest.php

@@ -485,7 +485,7 @@ class ServerRequest extends Request implements ServerRequestInterface
             if (substr($name, 0, 5) === "HTTP_") {
                 $name = $this->normalizeHeaderName(substr($name, 5));
                 $headers[$name] = $value;
-            } elseif ($name === "CONTENT_LENGTH" || $name === "CONTENT_TYPE") {
+            } elseif ($this->isContentHeader($name, $value)) {
                 $name = $this->normalizeHeaderName($name);
                 $headers[$name] = $value;
             }
@@ -493,6 +493,17 @@ class ServerRequest extends Request implements ServerRequestInterface
         return $headers;
     }
 
+    /**
+     * @param $name
+     * @param $value
+     * @return bool
+     */
+    private function isContentHeader($name, $value)
+    {
+        return ($name === "CONTENT_LENGTH" || $name === "CONTENT_TYPE")
+            && trim($value);
+    }
+
     /**
      * @param string $name
      * @return string

test/tests/unit/Message/ServerRequestTest.php

@@ -135,6 +135,20 @@ class ServerRequestTest extends TestCase
         $this->assertEquals("application/json", $request->getHeaderLine("Content-type"));
     }
 
+    /**
+     * @backupGlobals enabled
+     */
+    public function testGetServerRequestDoesNotReadEmptyContentHeaders()
+    {
+        $_SERVER = [
+            "CONTENT_LENGTH" => "",
+            "CONTENT_TYPE" => " "
+        ];
+        $request = ServerRequest::getServerRequest();
+        $this->assertFalse($request->hasHeader("Content-length"));
+        $this->assertFalse($request->hasHeader("Content-type"));
+    }
+
     public function testGetServerRequestReadsBody()
     {
         $body = new NullStream();