Today, I’ve discovered not yet described problem with Magento 1 PHP 7 compatibility.
On our of stores we care, after PHP 7.0.9 update admin panel resulted in 503 with info:
AH01067: Failed to read FastCGI header
in logs.
Issue was caused by following bug
https://bugs.php.net/bug.php?id=71709
and the solution is to patch Varien_Http_Adapter_Curl
--- <html>Curl.php (<b>f8d9852</b>)</html>
+++ <html><b>Current File</b></html>
@@ -188,7 +188,7 @@
} elseif ($method == Zend_Http_Client::GET) {
$options[CURLOPT_HTTPGET] = true;
}
- if (is_array($headers)) {
+ if ($headers && is_array($headers)) {
$options[CURLOPT_HTTPHEADER] = $headers;
}
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