错误脚本 额外的环境变量包括CGI 1.1 变量传递给错误脚本。这些CGI 1.1 变量有：
REDIRECT_REQUEST ：这是当正确发送给服务器的请求。
REDIRECT_URL ：这是导致错误的请求URL。
REDIRECT_STATUS ：这是如果NCSA HTTPd 已经允许应答的状态数字和信息。
另外，NCSA HTTPd在err_string=error_message时作为NCSA HTTPd产生的QUERY_STRING错误字符串传递。一些错误信息可以需要一些不在CGI规范中的文件头。基于这个原因，以下给出一个没有解析的文件头的脚本，它是用Perl编写的：
#!/usr/local/bin/perl
# 这是一个利用Perl编写的没有解析文件头的CGI 1.1错误脚本来处理错误请求。
$error = $ENV{'QUERY_STRING'};
$redirect_request = $ENV{'REDIRECT_REQUEST'};
($redirect_method,$request_url,$redirect_protocal) = split(' ',$redirect_request);
$redirect_status = $ENV{'REDIRECT_STATUS'};
if (!defined($redirect_status)) {
$redirect_status = "200 Ok";
}
($redirect_number,$redirect_message) = split(' ',$redirect_status);
$error =~ s/error=//;
$title = "<HEAD><TITLE>".$redirect_status."</TITLE></HEAD>";
if ($redirect_method eq "HEAD") {
$head_only = 1;
} else {
$head_only = 0;
}
printf("%s %s\r\n",$ENV{'SERVER_PROTOCOL'},$redirect_status);
printf("Server: %s\r\n",$ENV{'SERVER_SOFTWARE'});
printf("Content-type: text/Html\r\n");
$redirect_status = "<img alt=\"\" src=http://www.QQread.com/images/icon.gif>".$redirect_status;
if ($redirect_number == 302) {
if ($error !~ /http:/) {
printf("xLocation: http://%s:%s%s\r\n",
$ENV{'SERVER_NAME'},
$ENV{'SERVER_PORT'},
$error);
if (!$head_only) {
printf("%s\r\n",$title);
printf("<H1>%s</H1>\r\n",$redirect_status);
printf("This document has moved");
printf("<A HREF=\"http://%s:%s%s\">here</A>.\r\n",
$ENV{'SERVER_NAME'},
$ENV{'SERVER_PORT'},
$error);
}
} else {
printf("Location: %s\r\n",$error);
if (!$head_only) {
printf("%s\r\n",$title);
printf("<H1>%s</H1>\r\n",$redirect_status);
printf("This document has moved");
printf("<A HREF=\"%s\">here</A>.\r\n",$error);
}
}
} elsif ($redirect_number == 400) {
printf("\r\n");
if (!$head_only) {
printf("%s\r\n",$title);
printf("<H1>%s</H1>\r\n",$redirect_status);
printf("Your client sent a request that this server didn't");
printf(" understand.<br><b>Reason:</b> %s\r\n",$error);
}
} elsif ($redirect_number == 401) {
printf("WWW-Authenticate: %s\r\n",$error);
printf("\r\n");
if (!$head_only) {
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