Test interception of post data that are streams
{
    hasPostData : true
    headers : <object>
    initialPriority : High
    method : POST
    postData : ------WebKitFormBoundary Content-Disposition: form-data; name="blob 1"; filename="blob" Content-Type: application/octet-stream  In Xanadu did Kubla Khan ------WebKitFormBoundary Content-Disposition: form-data; name="blob 2"; filename="blob" Content-Type: application/octet-stream   A stately pleasure-dome decree ------WebKitFormBoundary 
    postDataEntries : [
        [0] : {
            bytes : ------WebKitFormBoundary Content-Disposition: form-data; name="blob 1"; filename="blob" Content-Type: application/octet-stream  
        }
        [1] : {
            bytes : In Xanadu did Kubla Khan
        }
        [2] : {
            bytes :  ------WebKitFormBoundary Content-Disposition: form-data; name="blob 2"; filename="blob" Content-Type: application/octet-stream  
        }
        [3] : {
            bytes :  A stately pleasure-dome decree
        }
        [4] : {
            bytes :  ------WebKitFormBoundary 
        }
    ]
    referrerPolicy : strict-origin-when-cross-origin
    url : http://127.0.0.1:8000/inspector-protocol/fetch/resources/post-echo.pl
}
echoed request body: ------WebKitFormBoundary
Content-Disposition: form-data; name="blob 1"; filename="blob"
Content-Type: application/octet-stream

In Xanadu did Kubla Khan
------WebKitFormBoundary
Content-Disposition: form-data; name="blob 2"; filename="blob"
Content-Type: application/octet-stream

 A stately pleasure-dome decree
------WebKitFormBoundary