public function get_errno() {
return $this->errno;
}
+
+ /**
+ * When using a proxy, an additional HTTP response code may appear at
+ * the start of the header. For example, when using https over a proxy
+ * there may be 'HTTP/1.0 200 Connection Established'. Other codes are
+ * also possible and some may come with their own headers.
+ *
+ * If using the return value containing all headers, this function can be
+ * called to remove unwanted doubles.
+ *
+ * Note that it is not possible to distinguish this situation from valid
+ * data unless you know the actual response part (below the headers)
+ * will not be included in this string, or else will not 'look like' HTTP
+ * headers. As a result it is not safe to call this function for general
+ * data.
+ *
+ * @param string $input Input HTTP response
+ * @return string HTTP response with additional headers stripped if any
+ */
+ public static function strip_double_headers($input) {
+ // I have tried to make this regular expression as specific as possible
+ // to avoid any case where it does weird stuff if you happen to put
+ // HTTP/1.1 200 at the start of any line in your RSS file. This should
+ // also make it faster because it can abandon regex processing as soon
+ // as it hits something that doesn't look like an http header. The
+ // header definition is taken from RFC 822, except I didn't support
+ // folding which is never used in practice.
+ $crlf = "\r\n";
+ return preg_replace(
+ // HTTP version and status code (ignore value of code).
+ '~^HTTP/1\..*' . $crlf .
+ // Header name: character between 33 and 126 decimal, except colon.
+ // Colon. Header value: any character except \r and \n. CRLF.
+ '(?:[\x21-\x39\x3b-\x7e]+:[^' . $crlf . ']+' . $crlf . ')*' .
+ // Headers are terminated by another CRLF (blank line).
+ $crlf .
+ // Second HTTP status code, this time must be 200.
+ '(HTTP/1.[01] 200 )~', '$1', $input);
+ }
}
/**
