So, in my .htaccess file I have this ErrorDocument lines:
ErrorDocument 500 http://www.example.com/500
Since my server runs multiple websites from the same core files, I just want to redirect all internal server errors to the same processing page. However, my problem is that it doesn't send any information about the page that cause the error, it redirects the page. I tried changing it to ErrorDocument 500 index.php?500 but that just causes a second internal server error when trying to locate the file. Any ideas on how I can successfully redirect it to my custom 500 error page and still acquire information about the page that caused the error in the first place?
In your ErrorDocument statement, you're giving a URL to a remote page. As a result, Apache sends the user a Location header, and the user goes off on their merry way.
Instead, change the URL to an absolute path to a local script that will handle the error:
ErrorDocument 500 /500.php
The script should be launched with a set of environment variables starting with REDIRECT_ that should contain the various paths and query strings involved in the error.
There is no way to both send the user elsewhere and also capture the information within ErrorDocument itself. On the other hand, your script can capture the information and then redirect the user, if you still want to handle it that way for some reason.
You could always look in the referrer field of the http request to determine on which URL the caller was before
Check your webserver's access log. There you will be able to see which request that is causing the 500 response code.
In Apache (using the default log format), a successful request (200 OK) could look like this:
127.0.0.1 - - [19/Jul/2010:18:25:54 +0200] "GET / HTTP/1.1" 200 663 "-" "Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8pre) Gecko/20100718 Ubuntu/10.04 (lucid) Namoroka/3.6.8pre"
A request that results in a 500 could look like this:
127.0.0.1 - - [19/Jul/2010:18:24:37 +0200] "GET / HTTP/1.1" 500 631 "-" "Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8pre) Gecko/20100718 Ubuntu/10.04 (lucid) Namoroka/3.6.8pre"
The response code is in the sixth column.
You can also check your PHP error log, which will contain all PHP errors assuming you've enabled error logging (you should).
Your apache server logs every Error occurs(Though it is configurable). You can able to open and manage this file using FileStream in your PHP website. See http://httpd.apache.org/docs/2.2/logs.html to see more about Apache log file. You can get a tutorial on .htaccess from http://www.freewebmasterhelp.com/tutorials/htaccess/.
To make your own processing, make a PHP file like error.php which will process your errors. You can redirect it using .htaccess file. After that if you want to go to a page you can do that by using header() method.
Related
We have upgraded our hosting platform with latest tech stack which includes PHP updates from Version 7.0 to 7.3 and enabled SSL certification.
After the upgrade, one of our user authentication method has failed though, it was working till the hosting platform upgrade.
Here is copy of PHP code - codecheck.php,
<html>
<body>
<?php
$header = "Content-Type: application/json";
header($header);
$code = $_GET["code"];
$codelistFile = "./codelist.txt";
$codeList = file( $codelistFile, FILE_SKIP_EMPTY_LINES);
$codelistOutput = sprintf('%s%s', $code, "\r\n" );
file_put_contents( $codelistFile, $codelistOutput, FILE_APPEND);
?>
</body>
</html>
Here is result of codelist.txt before the platform upgrade (with PHP version 7.0)
65cafead50f6d205d66f90c74f1683344ca86c8cc60fc0370c278ecb880da5c8
6e85e436538335da64f6e9172bd4191686e591aa390cca69acb9346668a48bd5
Here is result of codelist.txt after the platform upgrade (with PHP version 7.3)
774cad9dd07761fe79db8baa9370a3dd84abca558c73c1f46b39e7c996a26d70?code=774cad9dd07761fe79db8baa9370a3dd84abca558c73c1f46b39e7c996a26d70
f10bb27fb82b0d539d3607012655012764c60794cc656aa6912eccc16d927a82?code=f10bb27fb82b0d539d3607012655012764c60794cc656aa6912eccc16d927a82
Here is value of code repeated along with 'code' text itself hence the value of 'code' does not match when it compared.
Here is what I can see in ssl_access log files, ssl_access.log-20190629:79.1.200.79 - - [29/Jun/2019:07:46:24 +0100] "GET /codelist.php?code=ae21250db8b20cac3b7016e6d36a63de5846d537f032ed841a3e5c9121202cf4?code=ae21250db8b20cac3b7016e6d36a63de5846d537f032ed841a3e5c9121202cf4 HTTP/1.1" 200 19 "-" "Registration"
From this log file, I can see all GET requests to server appending the data twice.
I would expect it would be something like,
example.com/?code=123456789
but not as
example.com/?code=123456789?code=123456789
I am very new to PHP and HTTPS stuff, please help to figure out the issue. Thank you.
Here is an update:
As suggested, the issue seems to be more with SSL re-writing,
Here is code from desktop app where the app will connect and check the code with the server,
C++:
CString RegistrationServer::Uri( CString page, CString code )
{
CString sServer;
sServer.Format("http://www.mywebsite,com/%s?code=%s", page, code);
//Here page=codecheck.php and code = 10;
return sServer;
}
Here is log when submitted through desktop app,
27.62.66.34 - - [30/Jun/2019:21:55:51 +0100] "GET /codecheck.php?code=10?code=10 HTTP/1.1" 200 - "-" "Hack-o-Matic ver 0.01"
I can simulate the same request through web browser as below,
https://www.mywebsite/codecheck.php?code=10
Here is log when submitted through web browser,
27.62.66.34 - - [30/Jun/2019:21:46:28 +0100] "GET /codecheck.php?code=10 HTTP/1.1" 200 - "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36"
You can see the difference in both the request is http vs https.
When the request is coming from desktop app, the code data is appended twice which uses http.
It appears that changing desktop app to have https will help fix the issue but that's something that we can't do anything with desktop app.
So we have to relay on fix from Server side but our hosting company doesn't seem to understand the problem exactly.
They keep analysing the issue since last 3 days and coming up some fixes like googleapi call fixes but that's not helping to fixing up our real issue.
I'm not sure if I'm missing some better phrases/terms to explain this issue to them better. Please let me know if there is better way to explain the issue to our hosting company.
If nothing working out, Can I ask them to remove SSL certification?
Another Update:
Here is response from our hosting company,
We have this referred to our engineers and they confirmed that this only happens when calling http and not https. You need to use https now since you have enabled SSL.
Latitude-E6540:~$ curl -I http://www.mywebsite.com/codecheck.php?code=10
HTTP/1.1 301 Moved Permanently
Server: nginx/1.15.8
Date: Mon, 01 Jul 2019 11:03:47 GMT
Content-Type: text/html
Content-Length: 169
Connection: keep-alive
Location: https://www.mywebsite.com/codecheck.php?code=10?code=10
Strict-Transport-Security: max-age=15768000
Our engineers made some tests and they were not able to replicate when they set to https.
Latitude-E6540:~$ curl -I https://www.mywebsite.com/codecheck.php?code=10
HTTP/1.1 200 OK
Server: nginx/1.15.8
Date: Mon, 01 Jul 2019 11:03:35 GMT
Content-Type: application/json
Connection: keep-alive
Strict-Transport-Security: max-age=15768000
Here is log from server,
213.171.217.184 - - [01/Jul/2019:12:03:35 +0100] "HEAD /usage7.php?code=10 HTTP/1.1" 200 - "-" "curl/7.58.0"
They confirmed that this looks to be something with your local software settings as this only seems to get in the case of "after submitting the requests through browser, HTTP GET data is not appended twice but when the same is submitted through their desktop software, the HTTP GET data is appended twice"
What I wanted to ask you is, from below curl output itself where I can see the code is appended twice when request is made with http, Does this having any clue to spot where the issue resides?
Location: https://www.mywebsite/codecheck.php?code=10?code=10
How to solve PHP upgrade errors:
Post-event, how to find, diagnose and fix errors apparently caused by PHP updates?
1) Check your scripts for PHP Errors.
2) Check changes to your php.ini file caused by updates.Depending on your system and upgrade method, the php.ini file may be adjusted or even a new default one. Read the Migration Notes to see if this may apply to you. You will need to review and explore what's changed. Also manually compare your reserved/backup php.ini with the current/new live one.
3) Read the PHP Migration notes for each version you have upgraded into and then out of(These are best done from oldest to newest).
4) Read the corresponding PHP Changelog(s) and search this text (it's loooong) for the functions you've found be failing in step (1).
For your specific instances; your code is of a very low quality (you are sending HTTP heders after you are sending HTML code) so the issue may well be caused by PHP upgrading an already existing error from E_WARNING to E_ERROR, or similar.
Low quality code is most easily fixed by turing on error_reporting(E_ALL); either in the scripts or in the php.ini and reading the resulting error logs.
Good Luck.
Update
Even with this SSL log, I can see the value for code twice and the same written to the file. I would expect it would be something like example.com/?code=123456789 but not as example.com/?code=123456789?code=123456789.
The sign you have two ? means you should be exploring the code that sets the code= value, please update your question with this information, how is code set?
Your issue may be with your HTTP Host routing, Apache, Nginx, etc., your HTTP Host is possibly double loading, first the HTTP_ page and then secondly redirecting on to the HTTPS page with the original query string appended, thus appending twice.
I think one or both of the above is where your problem lies.
Update 2:
Comment by Thi:
Here is what my hosting company responded, "as per our engineers the cause of the logs is de to the website making http (not https) calls to the google api for css and other things. They have advised that you need to ensure that any code that relates to http is switched to https." - There is below line in all of our html pages and have changed it to https but it didn't help <link href="fonts.googleapis.com/…" rel="stylesheet" type="text/css">
This relates to what I reference above about checking your server routing for HTTP and HTTPS protocols.
Solutons:
1) Update all your outgoing links to https:// (or simply //) so:
<link href="//fonts.googleapis.com/..." rel="stylesheet" type="text/css">
will always connect securely, if loaded securely.
2) Use Content Security Policy (CSP) Upgrade Insecure Requests flag to do just that; to force all http:// links within your website to be turned into https:// links by the client browser.
In your .htaccess, or equivilant file:
Content-Security-Policy: upgrade-insecure-requests;
However, insecure calls to 3rd party resources will NOT be the cause of your code block being appended to your URL twice.
I have two servers each running a modified version of ZF2 Skeleton Application.
Server1:8080 - REST API that just returns JSON
Server2:8081 - Web client serving our customer
I am getting the famed 'White Screen of Death' in Server 2.
Visit a user's webpage via the route /%s - %s being their username, everything looks fine
User is presented with a status text box and submit button
I click submit with some text, and get the White Screen
I recently added an ability to POST a status update to the page.
server2:80 127.0.0.1 - - [03/Apr/2014:21:52:27 -0700] "POST /myusername HTTP/1.1" 500 357 "server1:8081/hwy9nightkid" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/33.0.1750.152 Chrome/33.0.1750.152 Safari/537.36"
Notice the log file is citing port 80.. not sure why.. but just to double check I looked at my endpoint.. it's working fine for everything else (user's profile data displays)
zf2-server2/module/Api/src/Api/Client/ApiClient.php: protected static $endpointHost = 'http://server2.local:8080';
This site was working great until I added this module's ability to POST data to Server2.. any ideas on how to debug this the Zend way? I'm new so I may just start littering the system with logging information to trace where it's truly stuck, maybe grab an IDE like PHPStorm if that would help.
I know for a fact the POST is received by the Server 1.. my guess is something happened processing that data.. and a 500 error was returned instead, but shouldn't that give me a nice looking error page???
Update & progress with 500 Error
In order to debug, I used an application called Postman
www.getpostman.com
Thanks to this utility for Chrome, I create a simple POST to my service and found an error message was being returned wrapped in JSON.
Error 500 : Table 'tablename' doesn't exist in db.
I'm going to look up how to properly handle errors / json responses that are unexpected.. and how to properly re-route my client to an error page.
Update TL;DR - Seems my Server2 Web Client is failing to either Log this error AND OR display a 500 error page.
I just moved my codeigniter app from one machine to another.
I’m getting the above error message.
here’s what I’ve checked so far:
config.php for code igniter has the following:
$config[‘base_url’] = ‘http://myserver/myapp/’;
when i navigate to
http://myserver/myapp/index.php
i don,‘t get any error messages, and nothing is displayed /rendered. I do a view source and there is no html on the page. (btw. I have specified “welcome” as my default controller in routes). when i navigate to:
http://myserver/myapp/index.php/welcome
it's the same result.
I checked my apache2 access log this is what it contains:
127.0.0.1 - - [14/Aug/2012:13:27:37 -0400] "GET /myapp/index.php/welcome HTTP/1.1" 200 293 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:14.0) Gecko/20100101 Firefox/14.0.1"
127.0.0.1 - - [14/Aug/2012:13:27:48 -0400] "GET /myapp/index.php/switches HTTP/1.1" 200 293 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:14.0) Gecko/20100101 Firefox/14.0.1"
shouldn’t it have
“GET http://myserver/myapp/index.php/welcome”
instead of just
“myapp/welcome”?
also i tried looking up the apache error message # 293 but i haven't come across anything that is helpful for troubleshooting.
The thing is other applications work. So i can do
“http://myserver/phpmyadmin”
and it works.
Also i created a test.php page in my “myapp” folder and it works too.
I’m not using .htaccess as far as i can tell. I have the following variables set in my config.php for codeigniter:
$config[‘index_page’] = ‘index.php’;
$config[‘uri_protocol’] = ‘AUTO’;
Error logging is turned on both in the php.ini file and also in the code igniter config file.
You have the "white screen of death". work backwards - install a "clean" version of Codeigniter and see if that works - then slowly move forward from there.
Then what you do is 'slowly' transition your site across. i.e. start with your site config - move it to the 'new' site. then change your main controller, then your db etc etc - until the error shows itself.
Could it be because you are using curly quotes rather than the regular ones?
$config[‘base_url’] = ‘http://myserver/myapp/’;
is different than
$config['base_url'] = 'http://myserver/myapp/';
The problem was the autoload.php contained the helper class 'url'. On the new machine, this item was not set. Its unclear why this file was the only one not copied over.. or overwritten properly. In any case, CI was dying on my pages because i make calls to base_url(). It's still unclear why the error messages have not been displayed.
For now, the app is back up and running. I am still trying to figure out why PHP errors are not displayed but i will doulbe check everything first before posting back.
Thanks all.
I had an issue on moving server where php short tags <?= ?> were not enabled in php.ini
this meant I was getting a blank page and this in the html source (output by layout->render_page):
<?= $header; ?>
<?= $contents; ?>
<?= $footer; ?>
Enabling them in php.ini short_open_tag = On fixed my issue.
Given the following PHP 5.1.6 code being served through Apache 2.2.9:
<?php
header("HTTP/1.1 404 Not Found");
When I browse to this file (with any browser) I get a "connection reset" message. (Firefox says "The connection to the server was reset while the page was loading.", and Chrome says "The connection to staging.neopets.com was interrupted." It makes no difference whether there's any body after the header call.
httpd.conf has rewrite rules that force all requests to run through a front controller script. This is how it's worked for years. The front controller tries to route the request, and if it can't, it sets the response code to 404, shows some error copy, and exits. For whatever reason, today it decided to lose its mind and blow up whenever a
error.log shows nothing. access.log shows the requests being served as 404s:
192.168.0.2 - - [26/Jan/2012:12:03:11 -0800] "GET /text.php HTTP/1.1" 404 20 "-" "Mozilla/5.0 (X11; Linux i686; rv:8.0.1) Gecko/20100101 Firefox/8.0.1"
The Apache config has not been touched in months. All other header responses work properly (401, 403, 200, 302, etc.), everything else is totally normal, but for some reason if I have PHP make the call above, it resets the connection.
I even watched it with Wireshark and it sends back a whole bunch of RST,ACK packets after the request is sent.
Doing wget localhost/test.php (from the machine in question) works fine, but doing wget badhost/test.php (from another machine) shows a connection reset error as well. Maybe Apache is doing some kind of reverse IP lookup on remote requests for 404s and melting down?
EDIT: After further investigation, turns out it's some network problem where 404s between the hosting facility and our office are killed with a connection reset. So, closing because it's not something that anyone here can answer ;-) Thanks!
That header that you send from your PHP script is not what makes Apache display its 404 page. Apache displays a 404 page (and sends a 404 Header) when it can't find the requested file. Since this is not the case here (because test.php is found and executed), that 404 header has no sense. That is probably what got your browser(s) confused.
If you call this as part of some application error handling or something, what you should do instead is redirect the user to the application's custom "File not found" page.
I've built a dynamic website and modified the .htaccess file for static URLs and I need to create a 404 page for SEO.
header("HTTP/1.0 404 Not Found");
I'm using the above PHP header() function when there is no matching link in database, but when I check the server logs it seems like this does not work and gives HTTP 200 OK status code.
Here's the line from the server log:
[My IP] - - [12/Jun/2011:01:47:38 +0300] "GET /4k.html HTTP/1.1" 200 3284 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.91 Safari/534.30"
4k.html is the link which does not exist.
Am I missing something?
From what I understand, you are rewriting all files to a single PHP file so PHP can read it and do what it needs to do to serve a page. That means that Apache's handling of 404 pages is going to be, essentially, overridden. At this point it is up to your PHP file to serve a page or display a 404. As far as Apache knows, the request resulted in an HTTP code of 200, because it doesn't play any part after it triggers PHP to parse the script and give the output to the client that requested it.
In your PHP script, you will be doing checking to see if the page exists or not. If the page exists, show the page, else, give a 404 message. By putting header("HTTP/1.0 404 Not Found", true); in your PHP file at the point where you know it's a 404, it will send the 404 header to the client, and therefore it was done correctly. To verify it is being sent correctly, trigger a 404 (by putting in a bogus url) and view the request details in Chrome Developer tools, you should see under Response headers that you are being sent a 404, while your Apache logs display a 200.