Using Socket.IO on android Always Returns XHR Poll Error
I am writing an android app that needs to connect to a Socket.IO instance running on a node.js server.
Attempting to connect to the instance and transmitting data using an iOS device works flawlessly, but when I try to do it with an android device it fails.
I am using the Native java client, and this is the code I’m using on the android side:
Whenever I try to connect (Basically as soon as the line mSocket.connect(); ) The log prints the following lines:
So I immediately get an xhr poll error after attempting to connect and all following connection attempts meet the same result.
I saw some posts saying such an issue might be cause by an SSL certificate issue though any attempts I made to temper with the SSL Context the Socket.IO library uses didn’t work.
If anyoen has an idea what I might be able to try to get this to work it would be excellent.
If any information or code sampels are missing, let me know and I’ll add them.
XHR Polling Error appears when debugger is present #1097
I am experiencing trouble trying to make a web socket connection on react-native. I am not sure if this platform is supported or not, however, this error is reproducible on a regular node.js app. Strangely enough I only have trouble when react-native’s built in debugger is disabled. I am testing this on IOS 10.2 with react-native v0.43.1 and socket.io-client v1.7.3 . My server is running socket.io v1.7.2 hosted on HTTP port 1337.
Steps to reproduce (if the current behaviour is a bug)
As soon as I implement socket.io-client in react-native and attempt a connection without the debugger enabled, it should reproduce with two errors based on the options. If I do not specify my transports option then the error would be XHR: POLLING ERROR . If I specify ‘websocket’ in my transports option then the error would become WEBSOCKET ERROR . Thats all I get.
Expected behavior
Regular web socket connection to my server. It works with the debugger enabled.
Setup
- OS: OSX El Capitan 10.11.6
- browser: I believe react-native uses webkit, however i am not sure.
- socket.io version: stated above
Other information (e.g. stacktraces, related issues, suggestions how to fix)
The only other issue I found related to this one was #1056 and I am surprised about how oddly related these issues are. I have retried the scenario on a regular node.js app and I experienced similar outcomes, however the errors were more detailed as shown below.
Without a specified transports option:
With transports: [‘websocket’] :
Also keep in mind, socket.io’s browser-based client works flawlessly connecting to this specific web server.
I have tried various different networks, ISP’s, and even VPN’s. I am clueless at this point.
Xhr poll error что это
Aqua data studio19 connection mysql8.0.11 error, can not connect?
solution: 1, replace the MySQL JAR package in Aqua Data Studio19 2, increasing in the Aqua Data Studio19 parameter configuration page? Useunicode = true & characterencoding = UTF-8 & ServerTim.
Linux Forgot Mysql8.0 Modify the root password; error: 1130-host . Is Not ALLOWED to Connect MySQL Remote Connection Error
Linux Forgot Mysql8.0 Modify root Password Skip permission login: [mysqld] Skip-grant-tables ## my.cnf file [mysqld] append this line, skip the permission table No password login Restart mysql Knowled.
MySQL remote connection error 1045, no permission problem (local can connect, can not connect using IP address)
the reason: MySQL defaults to not having remote connection permission, so you cannot connect using IP address. method: Grant MySQL remote connection permissions 1. In the MySQL bin directory, open the.
Neo4j connection (Connect to Neo4j) error
Question: Connect to Neo4j gives an error: Open the browser background prompt error message: wrong reason: The browser used a proxy server, causing the request to fail solution: Change the browser pro.
java.net.ConnectException: Connection refused: connect error
This error occurs when the tomcat closed, of course, is not the only closed when there will be, this error is generally occupied by the port or the last start of the tomcat is not fully closed To reso.
More Recommendation
Resolve as connection refused: connect error
I recently encountered the connection refused: connect problem when using AndroidStudio. After a long period of trouble, I finally found a more perfect solution. Now I share it with you. Here are the .
About «Connection REFUSED: Connect» error
wrong description wrong reason At this point I am configuring SpringCloud configuration client. SpringCloud will first load Properties first, but the property here is placed on the Gitee, and pulls a .
Android Connection Refused: Connect error
Foreword When I compiled in the new project, I passed the problem. Error prompts as follows Connection refused: connect Solution C: \ users
Clickhouse error Connection Refused: Connect
This mistake is generally reported, which is basically a configuration problem. Common configuration with user name, password, Host, Port, firewall, etc. These four points may look at the code when in.
# Troubleshooting
If you ever encounter an unexpected error with the Panel the first thing you will likely be asked for is the logs. To retrieve these, simply execute the command below which will output the last 100 lines of the Panel’s log file.
# Parsing the Error
When you run the command above, you’ll probably be hit with a huge wall of text that might scare you. Fear not, this is simply a stacktrace leading to the cause of the error, and you can actually ignore almost all of it when looking for the cause of the error. Lets take a look at some example output below, which has been truncated to make this easier to follow with.
The first thing you’ll want to do is follow the chain of numbers up until you find #0 , this will be the function that triggered the exception. Right above line 0 you will see a line that has the date and time in brackets, [2018-07-19 00:50:24] above for example. This line will be the human readable exception that you can use to understand what went wrong.
# Understanding the Error
In the example above we can see that the actual error was:
From this error we can determine that there was an error performing a file_put_contents()
(opens new window) call, and the error was that we couldn’t open the file because permissions were denied. Its okay if you don’t understand the error at all, but it does help you get faster support if you’re able to provide these logs, and at least find the source of the error. Sometimes the errors are pretty straightforward and will tell you exactly what went wrong, such as a ConnectionException being thrown when the Panel can’t connect to the Daemon.
# Utilizing GREP
If you’re trying to go through a bunch of errors quickly, you can use the command below which will limit the results returned to only be the actual error lines, without all of the stack traces.
# Transfer Exceptions / XHR Poll Error
If you are seeing errors similar to the examples below, chances are there is some networking related issue, or you just don’t have a required service running.
# Example Errors
"We were unable to connect to the main Socket.IO server, there may be network issues currently. The panel may not work as expected."
"A TransferException was encountered while trying to contact the daemon, please ensure it’s online and accessible. This error has been logged."
# Basic Debugging Steps
Ensure you have AdBlock disabled or whitelisted for your Panel and Daemon domains.
Check your browser’s console by pressing Ctrl + Shift + J (in Chrome) or Cmd + Alt + I (in Safari). If there is a red error in it, chances are that it will narrow down the potential problem.
Make sure if the daemon is properly installed and the active configuration matches the configuration shown under Admin -> Node -> Configuration in the Panel.
Check that the Daemon is running, and not reporting errors. Use service wings status to check the current status of the process.
Check that the Daemon ports are open on your firewall. The Daemon uses ports 8080 or 8443 for HTTP traffic, and 2022 for SFTP traffic.
Check that the Panel can reach the Daemon using the domain that is configured on the Panel. Run curl https://domain.com:8080 on the Panel server and ensure that it can connect to the Daemon.
Ensure that you are using the correct HTTP scheme for your Panel and Daemon. If the Panel is running over HTTPS the Daemon will also need to be running on HTTPS.
# More Advanced Debugging Steps
Stop the Daemon and run cd /srv/daemon; sudo npm start to see if there are any errors being output by the Daemon. If so, try resolving them manually, or contact us on Discord for more assistance.
Check your DNS and ensure that the response you receive is the one you expect using a tool such as nslookup or dig .
If you use CloudFlare make sure that the yellow cloud is disabled for your Daemon or Panel A records.
Make sure when using the daemon behind a firewall — pfSense, OpenSwitch, etc — that the correct NAT settings to access the Daemon’s ports from the outside network are setup.
If nothing is working so far, check your own DNS settings and consider switching DNS servers.
When running the Panel and Daemon on one server it can sometimes help if to add an entry in /etc/hosts that directs the public IP back to the server. Sometimes the reverse path is also needed, so you may need to add an entry to your servers /etc/hosts file that points the Panel’s domain to the correct IP.
When running the Daemon and Panel on separate VM’s using the same adapter make sure the VM’s can connect to each other. Promiscuous mode might be needed.
# Invalid MAC Exception
This error should never happen if you correctly follow our installation and upgrade guides. The only time we have ever seen this error occur is when you blindly restore the Panel database from a backup and try to use a fresh installation of the Panel.
When restoring backups you should always restore the .env file!
Sometimes when using the Panel you’ll unexpectedly encounter a broken page, and upon checking the logs you’ll see an exception mentioning an invalid MAC when decrypting. This error is caused by mismatched APP_KEY s in your .env file when the data was encrypted versus decrypted.
If you are seeing this error the only solution is to restore the APP_KEY from your .env file. If you have lost that original key there is no way to recover the lost data.
# SELinux Issues
On systems with SELinux installed you might encounter unexpected errors when running redis or attempting to connect to the daemon to perform actions. These issues can generally be resolved by executing the commands below to allow these programs to work with SELinux.