diff --git a/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php b/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php
--- a/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php
+++ b/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php
@@ -25,11 +25,18 @@
     $content_type = idx($_SERVER, 'CONTENT_TYPE');
     $is_form_data = preg_match('@^multipart/form-data@i', $content_type);
 
-    $raw_input = PhabricatorStartup::getRawInput();
-    if (strlen($raw_input) && !$is_form_data) {
-      $data += $parser->parseQueryString($raw_input);
-    } else if ($_POST) {
-      $data += $_POST;
+    $request_method = idx($_SERVER, 'REQUEST_METHOD');
+    if ($request_method === 'PUT') {
+      // For PUT requests, do nothing: in particular, do NOT read input. This
+      // allows us to stream input later and process very large PUT requests,
+      // like those coming from Git LFS.
+    } else {
+      $raw_input = PhabricatorStartup::getRawInput();
+      if (strlen($raw_input) && !$is_form_data) {
+        $data += $parser->parseQueryString($raw_input);
+      } else if ($_POST) {
+        $data += $_POST;
+      }
     }
 
     $data += $parser->parseQueryString(idx($_SERVER, 'QUERY_STRING', ''));
diff --git a/support/PhabricatorStartup.php b/support/PhabricatorStartup.php
--- a/support/PhabricatorStartup.php
+++ b/support/PhabricatorStartup.php
@@ -83,6 +83,26 @@
    * @task info
    */
   public static function getRawInput() {
+    if (self::$rawInput === null) {
+      $stream = new AphrontRequestStream();
+
+      if (isset($_SERVER['HTTP_CONTENT_ENCODING'])) {
+        $encoding = trim($_SERVER['HTTP_CONTENT_ENCODING']);
+        $stream->setEncoding($encoding);
+      }
+
+      $input = '';
+      do {
+        $bytes = $stream->readData();
+        if ($bytes === null) {
+          break;
+        }
+        $input .= $bytes;
+      } while (true);
+
+      self::$rawInput = $input;
+    }
+
     return self::$rawInput;
   }
 
@@ -128,47 +148,6 @@
     self::detectPostMaxSizeTriggered();
 
     self::beginOutputCapture();
-
-    if (isset($_SERVER['HTTP_CONTENT_ENCODING'])) {
-      $encoding = trim($_SERVER['HTTP_CONTENT_ENCODING']);
-    } else {
-      $encoding = null;
-    }
-
-    $input_stream = fopen('php://input', 'rb');
-    if (!$input_stream) {
-      self::didFatal(
-        'Unable to open "php://input" to read HTTP request body.');
-    }
-
-    if ($encoding === 'gzip') {
-      $ok = stream_filter_append(
-        $input_stream,
-        'zlib.inflate',
-        STREAM_FILTER_READ,
-        array(
-          'window' => 30,
-        ));
-
-      if (!$ok) {
-        self::didFatal(
-          'Failed to append gzip inflate filter to HTTP request body input '.
-          'stream.');
-      }
-    }
-
-    $input_data = '';
-    while (!feof($input_stream)) {
-      $read_bytes = fread($input_stream, 16 * 1024);
-      if ($read_bytes === false) {
-        self::didFatal(
-          'Failed to read input bytes from HTTP request body.');
-      }
-      $input_data .= $read_bytes;
-    }
-    fclose($input_stream);
-
-    self::$rawInput = $input_data;
   }