Okay here is our setup:
Simple form being submitted via AJAX using Prototype 1.7 to a Apache server captured by ColdFusion. (We have noticed similar bugs on pages that submit form data in the conventional way but these pages are used far less.)
Some of our clients are reporting an error. After looking through the logs and doing live testing from their machine Firebug Light is reporting that the request was being sent with the post data.
However on the server side the post data is not present in raw logs or ColdFusion's FORM object or in GetHttpRequestData().
This problem has been isolated to IE only even when running Chrome Frame and is intermittent.
We can not reproduce this error with our IE8 installs on our machines OR on their machines running Firefox or Chrome.
Any thoughts on this extremely difficult bug to track down?
Do you have an HTTP proxy involved in this somewhere? We have had issues in the past, I can't recall the details, but I know that it had something to do with using AJAX to POST. The proxy was configured such that a certain combination of headers would make it misbehave. Take a good look at the HTTP headers coming from the browser, comparing one that works and one that doesn't.
Related
I'm trying to scrape my own banking information by automating the process using Selenium in Ruby.
I'm running into a bizarre situation where performing the exact same sequence in the browser (whether just the normal browser or private/incognito) works fine, but when I try to log in under a Selenium-controlled browser I get back a strange 500 error from the server.
I've noticed the browser console logs also look different in terms of certain logging messages related to cookies, JS errors, libraries being loaded, etc.
I have found an answer on SO mentioning one possible difference in Chrome being a specific "cdc" string that might be detectable, but is there some kind of corresponding difference in Firefox/Geckodriver that could be used to detect the fact that I'm trying to automate the browser?
I'm not really sure where to look, because my understand was that running via Selenium should basically have identical behaviour to running via the browser itself.
Would love some guidance on what mechanisms may be in play to explain the difference in behaviour!
Problem
Sometimes important HTTP POST requests sent with AJAX got duplicated so several entries of the same data got created in the production database, that is of course not supposed by users.
What is important is that users have a poor internet connection and this request is taking a long time (9-20 seconds). We can't reduce this time because it is the requirements of business logic.
Requests are sent with http, not https.
Details
We have Apache/2.4.18 (Ubuntu) with PHP module loaded and two frontends: one for desktop (AngularJS) and one for mobile (React) devices. AngularJS is sending requests with the $http service, and React is using whatwg-fetch (tried whatwg-fetch-timeout also).
We know from Apache access.log and PHP logs that the same request is coming from the client several times and PHP processes them without the errors. But! These requests have response with 200 status code, %b > 0, and %O = 0, that means request is aborted before a response is sent (Apache logging format docs).
Reproduce
So we tried to reproduce and the same happens sometimes. The following case is just a reproduced case, but this happens on mobile devices (iPhones and Android phones) with different browsers installed. Also, we have repeated it in the Firefox under Windows.
Environment: Windows; both Chrome and Firefox; React frontend version; no proxy used.
That's what we found out: Google Chrome identifies the request as "Stalled", but is internally trying to send the request multiple times (and it is received and processed on the server actually), because it got the network error (ERR_CONNECTION_CLOSED). Only when the browser succeeded to fetch the response, it stops sending the repeating requests.
Gathered info
URL_REQUEST event log from chrome://net-internals/help.html#events (headers are also available there)
Google Chrome dev tools request screenshots:
Headers tab
Timeline tab
I personally can't reproduce this even once and I suppose a good internet connection is a reason for this.
I have googled a lot and even found some similar Chromium bugs, but nothing exactly about this problem.
Thank you in advance for any useful information.
I am also not pretty sure which tags should I set for this question, so if I should add or remove some, please tell me.
We are in the process of implementing Success Factors LMS, and trying to play and view SCORM compatible files exported from Adobe Captivate 8 and 9 in Success Factors LMS.
I get the message - 'ERROR – unable to acquire LMS API, content may not play properly and results may not be recorded. Please contact technical support’
I have tried SCORM versions 1.2 v3 and 2004 V2 and V4. We can view the content, however it does not track, show as complete etc.
We are also producing Scorm compliant files using Skillcast and Articulate, but we still hit the same issue, we can view the content after closing the API error window, but still does not track.
Anyone experienced this problem before? Or know of a fix?
Many thanks
Normally this issue comes up when the course is unable to get the SCORM API from the LMS...I have seen a ton of SCORM content running in Success Factors before, so I wonder if the issue is in the setup. Are you seeing any "Access Denied" type errors in the browser element inspector/developer tools? I wonder if the course just can not find/have access to the player window. If the course is launching in a new window, you may want to try launching it in the frameset. I have seen folks get around this issue by making sure the player and sco are in the same window...
If you wanted to rule out the content being the issue, you can always test your content in the SCORM Cloud's free sandbox (https://cloud.scorm.com) to make sure the course is properly asking for the API...
If you have any other questions, we would be happy to help...you can just shoot us an email at support#scorm.com.
Thank you!
Joe
The error occurs because the content is not speaking to the Learning Management System (LMS). The code that runs to initialize the session doesn't happen. There is no return "ping" from the LMS.
You will get this error when you publish in SCORM and run from your desktop, or from a web server that isn't connected to an LMS. If it occurs when you are launching from an LMS it can either mean that the SCORM API isn't configured correctly, or your content server is on a different domain (cross-domain) than your application servers.
To test, you should try launching your content in different browsers. Our system was configured in such a way that Firefox and Chrome read our content to be cross-domain issue, and threw the SCORM API error, but Internet Explorer worked just fine.
In the end, it was determined that our server configuration in tandem with our firewall and security settings read the Content server as cross-domain and we had to redeploy our content servers within the firewall.
I want to capture all the network calls from Web Driver in Java. I am not doing any UI testing, just testing JS execution and, requests and responses of some network calls.
I tried using Browser Mob as is suggested in most forums, but I need it to work across all browsers. It worked flawlessly with Firefox, but I was facing some issues with the others. Safari driver doesn't event support a Proxy capability.
I don't want to use Fiddler as it involves some manual steps around invoking and storing the calls. Whereas, Browser Mob being an in-code proxy can be integrated in a more smoother fashion.
I also tried using the RC-like package included in Selenium standalone server package. But, I have some HTTPS calls and some nested iframes in cross domains. I am particularly interested in some cross domain POST call and it doesn't work out that well. Also, people keep saying it's not recommended to use that package.
So, I had a solution where we can use a standalone proxy server running on a machine. Using host entries, we'll point Web Driver to hit the proxy instead of the actual server. The proxy will record all the incoming calls and route them to the actual server host. Later, I can make a request to the proxy which will return me all the calls it intercepted. I am not sure whether it's still called a proxy or a router.
I came across TCPmon, but it's no longer being supported. Does anyone know some similar tools that could run on Unix systems or any alternate solutions?
We modified the Fiddler rules script to include a new exec action. If you use their native script editor, it also provide auto complete features and we were comfortably able to get around it. The syntax is similar to that of JavaScript.
The Fiddler package comes with a ExecActions.exe which can be used to pass console arguments to a running Fiddler instance using the command prompt.
The code we wrote processed all the sessions captured by Fiddler and wrote it to a file in a custom JSON format and later used GSON to deserialize it.
Please let me know, if you want further details.
I'm not really sure how to word this exactly, so hopefully someone can make sense of it. I've been working on an iPad app that syncs files from a server to your iPad and lets you build presentations with the various files. The corporation I'm working with on this app has a wireless network that requires you to re-authenticate every hour. So every hour instead of getting the expected JSON api response, any HTTP request pulls down the page needed to reauth with the wireless network. I was wondering is there is a specific HTTP response code related to getting sent that page or a "best-practice" way of testing for that page as opposed to JSON.
Granted I could just test to see if the response is HTML, but that doesn't account for other redirect responses that I haven't found yet. I could just test part of the HTML to see if it matches a predetermined portion of the html, but I'm an outside contractor. I can't guarantee they won't change the markup or verbiage of the page after I've made my deliverable.
So does anyone out in the ether know a "best practices" methodology for testing if the app needs to reauth before syncing?
I noticed that on Mac OS X and maybe even iOS, when you connect to a new Wi-Fi network, it will try to contact www.apple.com. This is being done to check if the internet connectivity is available. If it's not available, the Captive Network Assistant will pop-up, showing you the authentication page, or sometimes when I'm in Starbucks, an advertisement.
Following your question, since Apple themselves is doing it this way, I think you could check for HTTP response code, look for something in the HTML markup (slightly discouraged though) or trying to connect to a known server (Reachability).
For a corporation practicing well-documented projects, I am quite sure they won't be changing things without making sure that your app, once deployed will continue to work.