Ive connected my ipad up so it is now talking to my OData.svc served up on the web. I can do a noraml query of a table without. But as soon as I add a select to that query to cut down the columns being transferred I get a http 400 error. I can get the exact url (http://mywebsite.com/OData.svc/Customers?$top=10&$select=CustomerName) it is accessing and put it into a browser and it works without issue. Any ideas what this could be?
I added a select to one of the queries in the Netflix example and it worked fine, it seems to be something with my OData.svc that isnt allowing selects to be performed from my ipad app (but browser is fine).
Thanks in advance
The $select requires that the request is sent with version 2.0. So its DataServiceVersion header must be set to 2.0;. If it's set to 1.0 the request will fail with 400. You can verify that this is the root cause by using some kind of network tracing software to see the body of the response, which should contain an error message saying that the feature you want to use requires a higher version.
It works from the browser, because the browser doesn't send any version header and in that case the server assumes the higher version the server can understand (so 2.0 in these cases).
Related
I have made a simple full stack application that uses a postgreSQL database. When previewing the site on desktop it works fine and is able to retrieve all the information with no problem so long as my backend server is on. I am trying to preview the site on my phone using my IP address followed by the port number and it comes up just fine but only the frontend is displaying on my phone. I am unable to see any information from my backend or database. Does anyone know why that is or how I can fix that to display on my phone (without hosting the site)?
1.Maybe it's just cashing issue.
check your mobile phone browser cash setting.
In general, browsers use caching technology for performance reasons. Caching refers to storing values that you previously requested locally and then reusing old values without using new values when a similar request comes in.
2.Maybe it's a front-end css problem.
If design-related elements such as css are not accurate, problems that cannot be seen on the screen may occur even if server data is imported normally.
3.Or maybe front-end can't get data from the server at all.
In this case, it is necessary to debug the server source, check whether it is sent normally on the screen, and check whether the response is received normally through the network terminal.
After checking the three above, even if you can't solve the problem,
At least you'll know exactly what the problem is.
I'm investigating by days with no results about this exception that my NextJS app is currently throwing, in particular when I try to open a single specific URL:
502: BAD_GATEWAY
Code: NO_STATUS_CODE_FROM_FUNCTION
ID: zrh1:4zx5l-1572269318137-64d401b5d058
Here's the screenshot:
Basically, I have on https://lucacattide.dev/about/en a page that this app should open. This is linked to a MongoDB third-party cloud API platform - Squidex - which is responsible to populate the page itself, via GraphQL queries. The app uses Apollo as GraphQL client. The app instead, is hosted on ZEIT.co serverless cloud, with Now 2.0 version.
During the development process, everything works fine. The page loads up and data is fetched in the right way. Notice that for development, I'm working on now-dev environment instead of a custom Express server, in order to reproduce the production one, as suggested by ZEIT itself.
The exception is being thrown on the production environment - the live one on the hosting platform, not on localhost; the main problem is that no errors are being shown on live logs or local development. So I'm literally going mad in inspecting the possible cause.
I've already tried to test the involved page, by splitting it in sections and trying to exclude child components, or focusing the inspection on the GraphQL query. But the first hasn't produced results and the latter works fine in every environment.
As last try, I deleted and re-created the back-end contents related to that page, because in the past I had a similar issue due to an old GraphQL edited schema that didn't reflected its modifications through the API - so in that case I was still receiving 502 errors. But this time it didn't worked.
Anyone could help me to understand what's going on, please?
Thanks everyone in advance
The issue was caused by an incompatibility between the d3-cloud library and the Now environment.
By replacing it with the react-wordcloud one, the error has been solved.
Thanks everyone for your assistance.
I have a strange problem whereby any REST APIs relating to SharePoint versions work when testing at design time but generate a 403 Forbidden error at runtime. What is also odd is that all other REST API calls work fine at both design time and runtime and all the parameters are identical to the ones that don't work (headers etc.) and I've done a cut and paste on everything, but still anything relating to versions isn't working, although that might just be a red herring?
The app can successfully delete files and overwrite them, check in and out, etc. so seemingly there are no permission issues. I have also tried checking a file out before reading the version information just in case (as check out is forced before any actions can be carried out on this site) but that didn't work either.
This is an example of one of the calls that is causing the error:
https://mycompany.SharePoint.com/sites/{SiteName}/_api/web/GetFileByServerRelativeUrl('/sites/{SiteName}/Shared%20Documents/{FilenameAndPath}')/version
Look at this post:
https://sharepoint/_api/web/folders/getbyurl('Documents')/files/getbyurl('myfile.docx')/versions?$filter=VersionLabel eq '2.0'
Check the Accept and Content-Type headers in the OnBeforeRequest REST API callback.
I have found that when testing the IDE will send for instance "application/json" for both, but at runtime, the platform adds ";utf-8" to the values of these headers. The requests are then often rejected without a proper error specification/declaration.
My problem is the infamous "StatusCodeException: 0" problem happening when using GWT 2.6.1 when accessing page via subdomain https://sub.site.com/.
Now, this happens quite sporadically for one customer using IE11 and I can't reproduce this from several distinct computers using IE11, IE10, IE9 or IE8 (not to talk about Chrome or Firefox).
Accessing exactly the same webapp from https://site.com/ seems to work fine for that customer.
This obviously lead me to conclusion that I'm having problem with Same Origin Policy.
What is strange though is that my webapp is designed in the way that no cross-domain or cross-subdomain requests are made. Same goes for no cross-protocol as well no cross-port requests. In other words, Same Origin Policy is not violated in this situation. As a confirmation of that, I can provide following proof:
While being at customer site I've seen how this is reproduced: customer starts using application and everything works fine - all requests are returning response normally. Then, after several minutes of working, exactly the same requests on the same page (without reloads) starts to fail with StatusCodeException: 0.
Basically, both https://sub.site.com and https://site.com points to the same IP, and there is only one Tomcat webapp serving exactly the same resources both for https://sub.site.com and https://site.com.
Another proof would be the codebase of the single GWT module itself: there I use only one instance of one service called DashboardService:
public class DashboardModule extends EntryPoint implements IDashboardModule {
private final DashboardServiceAsync dashboardService = createDashboardService();
#Override
public void onModuleLoad() {
// loading of module elements
// dashboardService is passed as a parameter so only one instance is used
}
/**
* PLEASE SEE QUESTION #1 BELOW CODE SNIPPET
*/
private static final String DASHBOARD_REQUEST_URL = "request";
private static DashboardServiceAsync createDashboardService() {
final DashboardServiceAsync service = GWT.create(DashboardService.class);
((ServiceDefTarget) service).setServiceEntryPoint(DASHBOARD_REQUEST_URL);
return service;
}
}
=================================== EDIT ====================================
After looking in the console at customer location, the error was always the following:
SCRIPT7002: XmlHttpRequest: network error 0x2ee4, ...
so it seems that this has nothing to do with Same-Origin Policy, because as per this article it is described as ERROR_INTERNET_INTERNAL_ERROR An internal error has occurred.
It's a pity, but I've found only 2 mentions of this error which were not resolved:
Error under IE10 and Error under IE11.
I have an assumption that customer is very probably accessing site through some proxy which slightly changes the requests and IE can't handle them.
Question 1: does anybody knows how can I simulate or reproduce mentioned error locally?
Question 2: does anybody knows how this problem can be gracefully worked around?
Question 3: is it ok to simply retry the request, or this request may have reached the server and modify it, so retrying it may produce duplicate modification?
Will try to setup forwarding proxy to simulate possible customer setup to at least reproduce mentioned error...
I greatly appreciate any help!
Ok, so after bugging with this problem for a workweek I finally managed to solve it.
Actually, I was able to reproduce very similar problem locally when I installed Apache2 server in front of Tomcat and accessed it from another VirtualBox Win7 host with IE11. This gave me sporadic StatusCodeException: 0 with Network error 0x2ef3 though but the behaviour was very similar: GWT-RPC requests started to fail after a minute or so. This was reproducable in IE10 and IE11 but working fine in IE8 and IE9 :) (is IE getting crappier with new versions?)
Locally I was able to fix that problem by simply disabling Keep-alive functionality for IE browsers by adding following lines to /etc/apache2/sites-enabled/default-ssl.conf Apache2 ssl configuration file:
# following line was added
BrowserMatch "Trident" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0
</VirtualHost>
</IfModule>
This basically tells Apache2 not to use keep-alive, use special SSL handling and generally downgrade to HTTP 1.0 standard whenever user-agent string in request has Trident word (matches IE11 and IE10 and possibly earlier IEs)
This added Connection: close HTTP header to each response and seemed to work fine locally.
On customers site this wasn't still working and produced the same Network error: 0x2ee4.
It may be worth noting that customer was using McAfee Web Gateway as forwarding proxy which stood in the middle of browser <-> server communication.
Long story short, I found out that the problem was in the following: when page loads there are multiple GET requests being sent to server to get the page, resources etc. Then after 10 seconds of using it (my webapp is single-page-application, so user may spend more than 10 minutes on same page) only GWT-RPC requests are being made to the server which are POST requests. And after a minute of using this page (I suspect 1 minute = keep-alive timeout of proxy server) these POST requests start randomly fail with 0x2ee4 network error.
After I implemented GWT-RPC retry functionality, I found out that after 30 seconds of retries simply ALL GWT-RPC requests fail with above error. Refreshing the page was solving this problem again for a minute or so and then same story happened.
So, I figured out that CRAPPY IE11 and IE10 are incorrectly handling combination of SSL, Keep-alive and POST requests. It seems that сrappy IE10 and IE11 simply can't renew keep-alive ssl connection using POST requests and only do this using GET requests.
Please note that Chrome, Firefox and other normal browsers are handling this situation quite well. When inspecting how Firefox behaves in such situation in Firebug: it can be clearly seen that POST request is made, then it is shown as aborted for like 0.5s and then this it is shown as successful (I suspect that Firefox handles this specific situation and makes GET request to server itself to renew SSL keep-alive connection and then retries POST request)
So, to fix this problem in IE I simply implemented functionality which "pings" server with GET request every 5 seconds (be ready to experiment with this time since this is most probably related to customer's proxy keep-alive timeout).
This made it work (please note that above Apache2 configuration hack is not needed in this case)
I really hope that this will help people with similar issue and save their time
Resources used:
IE Network Error 0x2ef3 question 1
IE Network Error 0x2ef3 question 2
IE Network Error 0x2ef3 question 3
Awesome q&a on how to implement transparent GWT-RPC retry functionality
P.S. Will I report this IE10 and IE11 issue to Microsoft? - really I'm not eager spending 30+ minutes of my time reporting issue on commercial crappy IE browser issue after I've already spent more than a week of finding out the problem.
I insist on recommending Chrome or Firefox or other normal browser to customers as viable alternative and I still think that IE11 is not suited for modern websites with AJAX
First time posting a question. I'm trying to call some SOAP webservices from inside a blackberry app using the ksoap2 library. I've successfully managed to get a response from the one service, which uses an HTTP url, but now that I'm trying to get response from a (different) HTTPS url, I've run up against a brick wall.
The response dump I'm getting has the following fault message:
"An error occurred while routing the message for element value : (country option I specified in my request). Keep-Alive and Close may not be set using this property. Parameter name: value."
The weird thing is that using Oxygen XML's SOAP tools with the XML request dump works just fine. Any ideas where to start looking? This has taken up a full day already.
Update:
Responding to your comment below - it turns out the double quoting is part of the SOAP spec. Some servers are more relaxed in their implementation, and will work without the quotes.
ksoap2 doesn't force the quotes onto your actions - you may want to patch your ksoap2 library to ensure the quotes are always there.
ymmv
Original:
I don't think this is a SOAP related problem, nor with BlackBerry.
I think the problem lies on the server side, since that error string is not a common error (just google it to see no hits on the whole internet other than this question).
Looks like this is a job for the network guy on the server side to tell you what he's seeing on his end.
Only other thing I can think of is to make the call using HTTP instead of HTTPS. You can then use some network sniffer to see what the difference between the messages is. Alternatively, install an SSL proxy with something like "Charles" and sniff the packets like that.