Plivo "Bad Media Description Error" - webrtc

I'm using Plivo WebRTC to make and received VoIP calls. Sometimes when I use Plivo.conn.call from JS SDK to start a call a get "Bad Media Description" error. This happens once every five to ten calls. Does anybody knows what "Bad Media Description" error means? Has anyone had this problem?
Thanks!

You could have looked into the Plivo JS Library using the Chrome console debug with break points. This way you could have identified the issue yourself.
It seems that this error occurs when the received response does not include the SDP (answer body) which is translated into a 400 type error or when something goes wrong when creating the answer (perhaps setRemoteDescription), which is very generic and translated into a 488 type error.
You should put more logs and steps if you want to receive any help, but other than that, there is not enough information to go on...

Related

Sending request from URL address and got error

https:?fields[OWNER_TYPE_ID]=4&fields[OWNER_ID]=23920&fields[TYPE_ID]=2&fields[COMMUNICATIONS][VALUE]="998974602446"&fields[SUBJECT]="new%20phone"&fields[START_TIME]=2022-09-17%2015:00:00&fields[END_TIME]=2022-09-17%2015:30:00&fields[COMPLETED]="N"&fields[PRIORITY]=3&fields[RESPONSIBLE_ID]=646&fields[DESCRIPTION]="важный%20звонок"&fields[DESCRIPTION_TYPE]=0
I am sending this request from URL and got some error {"error":"","error_description":"The field COMMUNICATIONS is not defined or invalid."}
I am doing something wrong and I don't know from this documentation I am doing what they are saying. Can someone help me solve this problem?
&fields[COMMUNICATIONS][VALUE]="998974602446" what I miss here
https://dev.1c-bitrix.ru/rest_help/crm/rest_activity/crm_activity_add.php
If the above method is not working possible there can two errors,
One is improper quotation or could be that the routes is not being handedover.
If the above two are good to go but still having the same error you can use some lightweight package for logging (ex- Winston or Morgan for JS).

API Kong - How to set custom error message?

I am not very familiar with Kong and things about it. I just want to ask, if it is possible to modify error message in the following situation.
Valid API URL for some request is e.g.
example.com/api/somerequest
If I want to make request to some invalid url e.g.
example.com/api/adffgdsfgfa
I will get this error message
"request_path": "/api/adffgdsfgfa",
"message": "API not found with these values"
I would like to replace this default message (API not found...) with my custom message. Could someone help me how to do it?
If you haven't explored already - you can use "exit-transformer" plugin for the same.
https://docs.konghq.com/hub/kong-inc/exit-transformer/

Should Internal Server Error be documented in swagger?

I am writing a new API and documenting it using Swagger/OpenAPI. It seems to be a good standard to document error responses, that the developer can expect to encounter.
But I cannot find any guide lines or best practices about Internal Server Error. Every path could in theory throw an unhandled exception. I do not expect it to happen, but it might. Should all paths have a response with status code 500 "Internal Server Error" or should I only document responses the developer can do anything about, i.e. 2xx, 3xx and 4xx?
The offical documentation shows an example for specifying all 5xx status codes in the responses section, but it does not go into details about the specific status code, or the message returned. It also mentions that the API specification should only contain known errors:
Note that an API specification does not necessarily need to cover all possible HTTP response codes, since they may not be known in advance. However, it is expected to cover successful responses and any known errors. By “known errors” we mean, for example, a 404 Not Found response for an operation that returns a resource by ID, or a 400 Bad Request response in case of invalid operation parameters.
You could follow the same approach and specify it like in the example. I think it's not important or even recommended to try to describe it more specifically, since you might not be able to cover all cases anyway and the client is not expected to act on the message returned for internal server errors (possibly other than retrying later). So for example, I would not recommend specifying a message format for it.
Omitting any responses with 5xx HTTP error codes makes sense as well.

The use of HTTP status to communicate application circumstances

Suppose I ask a question to an criminal register: http://server/demographics/party/{partyId} and that person is not known on that system.
Is that an error? Isn't it a good thing?
When returning 404, it is an error code, Restlet has implemented it as a specific URL cannot be resolved to a route to a server-resource (a handling class), an erroneous situation.
In my opinion, if a system understands a call, and is able to process it without errors, it should return 200 (HTTP-ok), and it should return the information: "We don't know this person".
What is the best thing to do?
There's nothing wrong in returning a 404 status code. It simply means "you asked for a resource, and it doesn't exist". If it did return 200, it would have to somehow return an additional status code telling you that everything went fine, but the resource couldn't be found. That's unnecessary, because 404 already means exactly that.
A status 500 is normally returned to mean "something went wrong, I can't tell you if the resource exists or not". Now if you returned a 404 to mean that, this would be a mistake.
Whether it's a good thing or not is not doesn't have anything to do with HTTP or REST. And BTW, if the register was a file containing the survivors of a disaster, you would probably find it bad to not find the person you looked for, unless maybe if the person is your mother in law, unless you actually love your mother in law. (this is meant as a joke, for those who don't find it obvious).
A web service could be implemented in a way that produces either kind of response.
If it is being implemented in a way that is truer to HTTP/Rest, then '404 not found' would be the appropriate response for not finding something. This is what the 404 status is for.
It may help to think of your request as saying 'I assume this record exists, and I want to see it', and the 404 response as saying 'You are in error that record does not exist'.
If this URL is going to be used by code (rather than be displayed in a browser), then if you don't make a distinction in the response status then you will have to add extra information to the response body to make the difference obvious.
If this URL is going to be displayed to a user in a browser, then the server is still able to display content in the response body for a 404.
Please read: http://archive.oreilly.com/pub/post/restful_error_handling.html#__federated=1
Quoting:
Conclusion:
Human Readable Error Messages: Part of the major appeal of REST based web services is that you can open any browser, type in the right URL, and see an immediate response -- no special tools needed. However, HTTP error codes do not always provide enough information. For example, if we take option 1 above, and request and invalid book ID, we get back a 404 Error Code. From the developer perspective, have we actually typed in the wrong host name, or an invalid book ID? It's not immediately clear. In Option 3 (DAS), we get back a blank page with no information. To view the actual error code, you need to run a network sniffer, or point your browser through a proxy. For all these reasons, I think Option 4 has a lot to offer. It significantly lowers the barrier for new developers, and enables all information related to a web service to be directly viewable within a web browser.
Application Specific Errors: Option 1 has the disadvantage of not being directly viewable within a browser. It also has the additional disadvantage of mapping all HTTP error codes to application specific error codes. HTTP status codes are specific to document retrieval and posting, and these may not map directly to your application domain. For example, one of the DAS error codes relates to invalid genomic coordinates (sequence coordinate is out of bounds/invalid). What HTTP error code would we map to in this case?
Machine Readable Error Codes: As a third criteria, error codes should be easily readable by other applications. For example, the XooMLe application returns back only human readable error messages, e.g. "Invalid Google API key supplied". An application parsing a XooMLe response would have to search for this specific error message, and this can be notoriously brittle -- for example, the XooMLe server might simply change the message to "Invalid Key Supplied". Error codes, such as those provided by DAS are important for programmatic control, and easy creation of exceptions. For example, if XooMLe returned a 1001 error code, a client application could do a quick lookup and immediately throw an InvalidKeyException.
Based on these three criteria, here's my vote for best error handling option:
Use HTTP Status Codes for problems specifically related to HTTP, and not specifically related to your web service.
When an error occurs, always return an XML document detailing the error.
Make sure the XML error document contains both an error code, and a human readable error message. For example:
1001
Invalid Google API key supplied
By following these three simple practices, you can make it significantly easier for others to interface with your service, and react when things go wrong. New developers can easily see valid and invalid requests via a simple web browser, and programs can easily (and more robustly) extract error codes and act appropriately.
The Amazon.com web services API follows the approach of returned XML document can specify an ErrorMsg element.
XooMLe also follows this approach. (XooMLe provides a RESTful API wrapper to the existing SOAP based Google API).
Another approach is by DAS ( Distributed Annotation System) which always returns 200 if there was no HTTP-error and has error information in the HTTP-header, which is less favorable, because it is not human readable, as a browser does not display the HTTP-header.

What does "Predicate Mismatch for View"

I am writing a iOS client for a an existing product that uses a legacy SOAP webservice. I got the proper URL to send my SOAP/XML messages too and even have some samples. However, none of them seem to work...
I always get a 404 error with the following error text "Predicate mismatch for View"
I am using an ASIFormDataRequest for the actual request and apending the data (SOAP XML in this case) via [someFormRequest appenData:myData].
I am flat out of ideas here and am wondering what, if anything I am doing wrong. Or should I ping one of the back end guys? Could this error be a result of something on the server side?
This is an error message spit out by the pyramid web framework when attempting to access a URL without supplying all of the required parameters. You definitely want to double check that the URL you are using has all of the required params (headers, query string options, request body, etc) and if you're convinced that what you are sending is correct then but your backend guys because it's definitely a miscommunication or a bug between the two of you.