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shader | Last updated: Nov 16, 2021 07:06AM UTC

I Only changed a character,but the content-length changed a lot(about 300)

shader | Last updated: Nov 16, 2021 07:08AM UTC

this is the orginal http message, its content-length is 818 and its is right POST http://www.cduestc.cn:50011/upload.php HTTP/1.1 Host: www.cduestc.cn:50011 Content-Length: 818 Accept: application/json, text/javascript, */*; q=0.01 X-Requested-With: XMLHttpRequest User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36 Content-Type: multipart/form-data; boundary=----WebKitFormBoundarySAntvPZPIAhhda5J Origin: http://www.cduestc.cn:50011 Referer: http://www.cduestc.cn:50011/index.php Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9,en;q=0.8 Cookie: PHPSESSID=do7pbvntb3r8ej4l6qjsdiku0q; JSESSIONID=9EAA770A65439DBCC75987E094808D7F Connection: close ------WebKitFormBoundarySAntvPZPIAhhda5J Content-Disposition: form-data; name="file"; filename="pil_red.jpg" Content-Type: image/jpeg �����JFIF���������C�    $.' ",#(7),01444'9=82<.342���C  2!!22222222222222222222222222222222222222222222222222�����"�������������� �������}�!1AQa"q2���#B��R��$3br� %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz����������������������������������������������������������������������������������� ������w�!1AQaq"2�B���� #3R�br� $4�%�&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������� ��?��袊����� ------WebKitFormBoundarySAntvPZPIAhhda5J--

shader | Last updated: Nov 16, 2021 07:09AM UTC

Then I changed the filename with a character, and sent the http message again. However, the content-length suddenly become 1199 POST http://www.cduestc.cn:50011/upload.php HTTP/1.1 Host: www.cduestc.cn:50011 Content-Length: 1199 Accept: application/json, text/javascript, */*; q=0.01 X-Requested-With: XMLHttpRequest User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36 Content-Type: multipart/form-data; boundary=----WebKitFormBoundarySAntvPZPIAhhda5J Origin: http://www.cduestc.cn:50011 Referer: http://www.cduestc.cn:50011/index.php Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9,en;q=0.8 Cookie: PHPSESSID=do7pbvntb3r8ej4l6qjsdiku0q; JSESSIONID=9EAA770A65439DBCC75987E094808D7F Connection: close ------WebKitFormBoundarySAntvPZPIAhhda5J Content-Disposition: form-data; name="file"; filename="pil_rxed.jpg" Content-Type: image/jpeg �����JFIF���������C�    $.' ",#(7),01444'9=82<.342���C  2!!22222222222222222222222222222222222222222222222222�����"�������������� �������}�!1AQa"q2���#B��R��$3br� %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz����������������������������������������������������������������������������������� ������w�!1AQaq"2�B���� #3R�br� $4�%�&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������� ��?��袊����� ------WebKitFormBoundarySAntvPZPIAhhda5J--

shader | Last updated: Nov 16, 2021 07:11AM UTC

My burp version is 2021.5.1. Can somebody tell me why the content-length changed so strange by only adding just a character in body?

Liam, PortSwigger Agent | Last updated: Nov 16, 2021 11:16AM UTC