Is it possible to setup RabbitMQ Web STOMP connection without SockJS library?
I have played around with rabbitmq-web-stomp plugin without a success as the initial response generated by the server is Welcome to SockJS! (which is obviously not a STOMP based message).
Is SockJS really required? What does it bring into the game (besides legacy browser support)?
SockJS protocol does support raw WebSocket clients under /websocket path.
Any SockJS server complying with 0.3 protocol does support a raw WebSocket url. The raw WebSocket url for the test server looks like:
ws://localhost:8081/echo/websocket
You can connect any WebSocket RFC 6455 compliant WebSocket client to this url.
This is supported by Rabbit's implementation as well. So the default endpoint is: http://example.com:15674/stomp/websocket.
Related
I am developing an https http/2 proxy server as mentioned here:
https://chromium.googlesource.com/chromium/src/+/HEAD/net/docs/proxy.md#HTTPS-proxy-scheme
It is mentioned there that
HTTPS proxies using HTTP/2 can offer better performance in Chrome than a regular HTTP proxy due to higher connection limits (HTTP/1.1 proxies in Chrome are limited to 32 simultaneous connections across all domains).
But when users try to surf a website which is using websocket over raw http connection, the response contains 'Upgrade' http header which is forbidden to be used in http/2 as there is no websockets for HTTP/2.
https://daniel.haxx.se/blog/2016/06/15/no-websockets-over-http2/#:~:text=There%20is%20no%20websockets%20for%20HTTP%2F2.&text=That%20spec%20details%20how%20a,connection%20into%20a%20websockets%20connection.
The problem comes from the fact that when http1.1 traffic passes through an https proxy which implements http/2, headers must be transferred from http1.1 to http/2. Of course when the webpage is using TLS, there is no such a problem as all traffic passes through a connection made by http 'CONNECT' method. The problem occurs when the website does not use TLS.
If there is no solution to this problem, it means that HTTPS proxies should not implement HTTP/2 protocol.
As there is no websockets for HTTP/2
The link you posted is old, and since then WebSocket over HTTP/2 has been specified by RFC 8441.
The behavior of a HTTP/2 proxy is specified in RFC 7540, section 8.3.
When the client communicates with the proxy using secure HTTP/2, each HTTP/2 stream is a "tunnel" to the server.
Client and proxy communicate using secure HTTP/2, and the "tunnelling" happens because each HTTP/2 stream becomes an "infinite" request with an "infinite" response, i.e. an "infinite" series of HTTP/2 DATA frames in both directions that carry an opaque byte array payload.
The job of the proxy is to unwrap the DATA frames received by the client, and forward the byte array payload to the server, perhaps re-wrapping it into an HTTP/2 DATA frame if the communication between proxy and server is also HTTP/2 (it may be possible to optimize away the unwrapping and re-wrapping but it may be tricky -- for example the stream numbering could be different).
When a client attempts to perform WebSocket over HTTP/2, the browser will do as specified by RFC 8441, and the proxy will receive a CONNECT request with a :protocol pseudo-header, and the proxy will have to know what to do in that case, depending on what protocol it uses to communicate with the server.
What above describes what your proxy need to support when the communication with the client is HTTP/2.
If your proxy needs to support clients that speak HTTP/1.1, then you need to implement what is required for a proxy to support HTTP/1.1 and WebSocket proxying, and it's typically not difficult: the first is just HTTP/1.1 forwarding or HTTP CONNECT "tunnelling", the second is WebSocket HTTP Upgrade request forwarding followed by a "tunnel" connection or even a fully fledged WebSocket proxy.
Disclaimer, I have implemented all of the above in the Jetty Project.
You can use Jetty 10 or later to implement an HTTP/1.1, HTTP/2, or WebSocket, both client and server (and therefore a proxy). WebSocket over HTTP/2 is supported too.
Finally, to answer your last question, it is perfectly possible to have secure proxies support HTTP/2, even in presence of WebSocket.
For example, a clear-text WebSocket connection to a server starts with an HTTP upgrade request; this request will be sent, encrypted, to the proxy which will decrypt it and forward it to the server (using any protocol the server supports -- could even be WebSocket over secure HTTP/2); the server will reply with a 101 and upgrade the connection to WebSocket; the proxy will receive the 101 from the server and upgrade to a "tunnel" or to a WebSocket proxy; the proxy encrypts the 101 response and forward it to the client; the client decrypts it and upgrades the connection to WebSocket.
At this point, the client is speaking clear-text WebSocket to the server through a secure connection with the proxy (the proxy sees the clear-text WebSocket communication).
Viceversa, a secure WebSocket connection to a server starts with establishing a HTTP CONNECT tunnel through the proxy to the server; then the client will establish the secure communication with the server; then it will send the HTTP upgrade to WebSocket to the server (through the proxy tunnel).
At this point, the client is speaking secure WebSocket to the server through a secure connection with the proxy (the proxy cannot see the WebSocket communication).
The HTTP/2 variants are similar, just taking into account the HTTP/2 specific ways of "tunnelling" and transporting WebSocket.
I have implemented mqtt using server connection tcp socket on my machine with mosquitto broker. I have totally understood the mqtt protocol and its frame format. I want to publish my data over webserver which supports mqtt over websocket.
How can I start with this thing?
I am not clear with websocket concept
Can I implement websocket using tcp or is there any other method.
do i have to use http to implement mqtt over web socket as to send data over webserver?
As http and mqtt use different methods to send or receive data.
I don't want to use ready libraries such as paho.
I am totally new to this socket programming.any help or guideline will greatly appreciated!!!
Websockets are an extension to the HTTP protocol, you need to use a correctly formatted HTTP request to setup a new Websocket connection.
Once the connection is setup it can be used to send the exact same binary MQTT packets that you would send over an existing TCP connection.
I suggest you look at using an existing library like libwebsockets to handle the Websocket connection setup, then you should be able to interface your existing code to just use the websocket handle instead of the socket handle.
If you REALLY don't want to use a library then you will need to start by reading the Websocket RFC https://www.rfc-editor.org/rfc/rfc6455
wss://www.mysite.ca/socket.io/?EIO=3&transport=websocket
This is how chrome webdevoloper tools shows the request url of a socket io.
I am trying to understand more about EIO=3&transport=websocket .
I have to invoke the url from an API tool
These are query parameters that the socket.io client sends to the socket.io server as part of the initial connection request.
EIO=3, I believe, is the version number of the engine.io sub-system in socket.io. If the server is not compatible with this version number, it will likely fail the attempt to connect.
transport=websocket says that socket.io wants to use the websocket protocol as the eventual transport. socket.io has several different transports it supports including web polling and a flash-based protocol.
To connect to socket.io server, you will need a full-fledged socket.io client. You can't make a socket.io connection by just sending a URL from a tool to the server. There's a lot more involved than that in establishing a working socket.io connection.
What are the major differences between WebSocket and STOMP protocols?
This question is similar to asking the difference between TCP and HTTP. I shall still try to address your question, its natural to get confused between these two terms if you are beginning.
Short Answer
STOMP is derived on top of WebSockets. STOMP just mentions a few specific ways on how the message frames are exchanged between the client and the server using WebSockets.
Long Answer
WebSockets
It is a specification to allow asynchronous bidirectional communication between a client and a server. While similar to TCP sockets, it is a protocol that operates as an upgraded HTTP connection, exchanging variable-length frames between the two parties, instead of a stream.
STOMP
It defines a protocol for clients and servers to communicate with messaging semantics. It does not define any implementation details, but rather addresses an easy-to-implement wire protocol for messaging integrations. It provides higher semantics on top of the WebSockets protocol and defines a handful of frame types that are mapped onto WebSockets frames. Some of these types are...
connect
subscribe
unsubscribe
send (messages sent to the server)
message (for messages send from the server) BEGIN, COMMIT, ROLLBACK
(transaction management)
WebSocket does imply a messaging architecture but does not mandate the use of any specific messaging protocol. It is a very thin layer over TCP that transforms a stream of bytes into a stream of messages (either text or binary) and not much more. It is up to applications to interpret the meaning of a message.
Unlike HTTP, which is an application-level protocol, in the WebSocket protocol there is simply not enough information in an incoming message for a framework or container to know how to route it or process it. Therefore WebSocket is arguably too low level for anything but a very trivial application. It can be done, but it will likely lead to creating a framework on top. This is comparable to how most web applications today are written using a web framework rather than the Servlet API alone.
For this reason the WebSocket RFC defines the use of sub-protocols. During the handshake, the client and server can use the header Sec-WebSocket-Protocol to agree on a sub-protocol, i.e. a higher, application-level protocol to use. The use of a sub-protocol is not required, but even if not used, applications will still need to choose a message format that both the client and server can understand. That format can be custom, framework-specific, or a standard messaging protocol.
STOMP — a simple, messaging protocol originally created for use in scripting languages with frames inspired by HTTP. STOMP is widely supported and well suited for use over WebSocket and over the web.
The WebSocket API enables web applications to handle bidirectional communications whereas STOMP is a simple text-orientated messaging protocol. A Bidirectional WebSocket allows a web server to initiate a new message to a client, rather than wait for the client to request updates. The message could be in any protocol that the client and server agree to.
The STOMP protocol is commonly used inside a web socket.
A good tutorial is STOMP Over WebSocket by Jeff Mesnill (2012)
STOMP can also be used without a websocket, e.g. over a Telnet connection or a message broking service.
And Raw WebSockets can be used without STOMP - Eg. Spring Boot + WebSocket example without STOMP and SockJs.
Note: Others have well explained what are both WebSocket and STOMP, so I'll try to add the missing bits.
The WebSocket protocol defines two types of messages (text and binary), but their content is undefined.
STOMP protocol defines a mechanism for client and server to negotiate a sub-protocol (that is, a higher-level messaging protocol) to use on top of WebSocket to define following things:
what kind of messages each can send,
what the format is,
the content of each message, and so on.
The use of a sub-protocol is optional but, either way, the client and the server need to agree on some protocol that defines message content.
Reference
TLDR; STOMP is a framework built on top of websockets, i.e. stomp utilizes websockets in the background. If you are thinking of building a notification/messaging system then use stomp.
https://stomp.github.io/stomp-specification-1.2.html
I have developed a chat application by using Spring Stomp and socketjs .
I have successfully connected to the websocket over my clients but I can not connect to websocket by using Advanced Restclient -> socket implementation.
Why?
Thanks
if i didnt use socketjs , i can succeed to connect over Advanced Rest Client. To connect websocket without using socketjs, you should set the allowed origins : setAllowedOrigins('*')
Also if you are using stomp without socketjs , you can succeed to open a websocket connection via Advanced Rest Client, because stomp just a sub-protocol over websocket connection. But to receive messages over websocket, you should subscribe to STOMP queue, it is impossible with Advanced Rest Client.
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Restclients runs on http protocol. Restclients not yet understand the web socket and sock JS protocol. That is the reason your rest client didn't connected to server.