attachment filename, default running-config.xml. Panorama // passes the chosen snapshot name here, so vary it to avoid // cache or on-disk collisions between attempts. // ?size= approximate body size, default 65536 // ?delay_ms= spread the body over this many ms. Not needed for the // reported case (the failure happens before a single byte is // delivered to the client) but useful to hold the surrogate // download open while inspecting active_surr_download_items_. set_time_limit(0); // Everything this script does before header() must produce no output. A single // notice or deprecation from the body-building loop counts as output, and PHP // then refuses every header() below -- leaving a text/html page instead of an // attachment. That does not look like a broken fixture, it looks like the bug // went away: the navigation commits, the new tab renders, the download path is // never entered. Buffer the build so a stray notice cannot do that silently, // and surface anything caught as a response header instead. ob_start(); $name = isset($_GET['name']) ? basename($_GET['name']) : 'running-config.xml'; $target_size = isset($_GET['size']) ? intval($_GET['size']) : 65536; $delay_ms = isset($_GET['delay_ms']) ? intval($_GET['delay_ms']) : 0; $head = "\n" . "\n" . " \n" . " \n" . " \n" . " yes" . "\n" . " \n" . " \n" . " \n" . " \n" . " \n" . " \n" . " \n"; $tail = " \n" . " \n" . " \n" . " \n" . "\n"; $body = $head; $if_no = 0; while (true) { $if_no += 1; $entry = sprintf(" \n" . " " . "\n" . " uplink-%03d\n" . " \n", // intdiv, not "/": in PHP 8 the "/" operator yields a float // and applying "%" to it raises an implicit-conversion // deprecation. Any notice printed here is body output, which // makes the header() calls below fail with "headers already // sent" -- and without Content-Disposition the response is no // longer a download, so the test silently stops reproducing. $if_no, intdiv($if_no, 254) % 254, $if_no % 254, $if_no); if (strlen($body) + strlen($entry) + strlen($tail) > $target_size) { break; } $body .= $entry; } $body .= $tail; // Discard anything the build leaked so the headers below can still be sent. If // something was caught, report it in X-Fixture-Warning rather than swallowing // it: the response stays a valid download and the problem is still visible in // devtools / the HAR. $leaked = ob_get_clean(); if ($leaked !== '' && $leaked !== false) { header("X-Fixture-Warning: " . str_replace(array("\r", "\n"), ' ', substr($leaked, 0, 400))); } // These are the headers that matter. Content-Disposition: attachment is what // makes handle->IsDownload() true and HasCommitted() false, which is the whole // bug -- without it the new tab commits normally and client_loc/Initial is // sent. header("HTTP/1.1 200 OK"); header("Content-Type: application/xml"); header("Content-Disposition: attachment; filename=\"" . $name . "\""); header("Content-Length: " . strlen($body)); header("Cache-Control: no-cache"); if ($delay_ms <= 0) { echo $body; } else { $chunks = 20; $chunk_size = (int)ceil(strlen($body) / $chunks); $chunk_delay_us = intval($delay_ms * 1000 / $chunks); for ($offset = 0; $offset < strlen($body); $offset += $chunk_size) { echo substr($body, $offset, $chunk_size); flush(); usleep($chunk_delay_us); } } ?>