We have an ASMX web service, the hosting server accepts API calls from clients.
We need to use these calls and the data for some standalone analysis.
How can we listen all the API calls and get the data?
For some reason we don't have permit to update codes in the web service host. Need to listen in a standalone utility.
Searched in the internet, we couldn't have two server listening to the same port.
Thanks!
Related
I've created a SOAP Service in ABAP, which perfectly works inside the network.
Now I wan't it to be called from outside and I haven't really found any tutorial.
Most likely a SAP Web Dispatcher or a reverse proxy is required, but how to use them?
Or is there an easier way to make the endpoint "public" and callable from the "outside"?
Making it public not part of SAP system. You need to configure your network to allow incoming request. Generally you need to configure your firewall. You need to open a port on firewall and redirect it to your SAP server http/https port. It will also create a risk for opening http/https port to outside. You must sure about limit your your web service user authorizations and changing all default passwords and using update date SAP system for security patchs.
For more get security I prefer to use a proxy server like nginx/apache to just serve your SOAP service over it.
Usually it is done thourgh reverse-proxies, to minimize risk of attacks from public Internet.
The general schema looks the same, although there are multiple variations depending on the company
The oldest and the most traditional reverse-proxy for SAP systems is a Web Dispatcher
SAP Web Dispatcher it includes load balancing and HTTP filtering
https://informatik.rub.de/wp-content/uploads/2021/11/2_sap-secure-configuration.pdf
https://wiki.scn.sap.com/wiki/display/SI/FAQ+Web+Dispatcher
https://blogs.sap.com/2021/05/09/landscape-architecture-sap-web-dispatcher-deployment/
SAP Gateway is a framework for exposing functionality as REST/SOAP web-services
https://blogs.sap.com/2018/04/15/sap-odata-service-get-consume-rest-service/
The tutorial for configuring SAP Web Dispatcher + SAP Gateway together
https://help.sap.com/saphelp_uiaddon10/helpdata/en/ec/342f1809c94d2b817ba772fe69e43f/content.htm?no_cache=true
The other options for reverse-proxy for SAP:
nginx
Apache
...
You are free to choose any reverse proxy on the market depending on your environment.
I have deployed an application hosting Kestrels server bindded to a specific port as web job .I want to access that port in order to have to access to APIs implemented in that application.
If I try to bind with port 443 it fails on other ports the server starts but cant interact with external requests.Is there any way I can expose this port to listen to incoming requests
Azure Web App only support port 443 and 80. And webjob host in Azure App Service.
After a lot of searching for information and trying. I can tell you with certainty that other ports cannot be used.
For more details, you can read below post.
Opening ports to Azure Web Job
Is it possible to use an Azure Web Job to listen on a public socket
The above is a statement of port restrictions in webjob.
For you want webjob to monitor and process incoming requests, my suggestion is that webjob monitors ports 443 and 80 instead of binding. You can use RawSocket.
Monitor all requests, analyze whether the request content contains instructions that need to be executed, and then proceed to the next business operation.
If you already have completed project, you also can choose VM or Cloud Services.
I'm very fresh and beginner in the web services world, I'm trying to learn how to deploy and consume services.
My question: Using any technology (such as Java), when I want to invoke some web service that is deployed in a remote server, do i need to install and configure a localhost server in order to access the web service? or I can access it without install server
Note: I'm asking about consuming a web service not developing a one
Thanks in advance
No. Just as your web browser doesn't require a web server to access other web servers, your code doesn't require a web server to access other web servers.
I developed our websocket project on wildfly. When we test it on localhost or within our local network, everything work fine. But when I deployed it on AWS, websocket don't work any longer. We can access other html pages. But when we conenct to "ws://ip/project location ", chrome just says hand shake error. I have experienced the same web socket problem on jelastic hosting too. My question is
Why it is happening like this?
Is websocket protocol not stable enough?
Is there any suitable hosting for websocket projects in java?
So far balancers don't forward websocket headers. To make WS working you must have a public IP address and no other services in front of your application.
I suggest you try deploying to the cloud provider : Heroku - their sample app code using node.js and websockets will get you up and running quickly. A locally running websocket app which uses a specific port - say 8888 will run fine on heroku with :
var port = process.env.PORT || 8888;
as heroku internally will deploy your app with a run-time generated port visible via PORT .
If you are using node.js with websockets I suggest using the einaros ws implementation
var WebSocketServer = require("ws").Server;
which seamlessly handles the notion of ws port -vs- the http port
Currently ELB doesn't support Websocket in HTTP mode. To be able to handle Websocket you need to configure the ELB in tcp mode (the payload of the tcp connection will be send directly to the server, so the ELB doesn't impact the http and ws flow). With this set up you won't be able to see the caller ip.
Without the ELB Websocket works perfectly (AWS only sees ip traffic and the OS only tcp one), we haven't change any thing for a plain old http server in order to use WS (except the WS handling code in the web server).
To know if you are using ELB look at the bill, AWS can provide you a lot of very interesting services, for a fee.
I am trying to turn the server/client model into a server/server model, so as to have the my 2 computers running the program find each other by perhaps a url or something else like ip address.I was wondering if it was possible for 2 servers to connect via url's. or is ip the only way? examples would be appreciated since this is my second day writing c++.
For HTTP, the server only talks to clients. So, I am not sure what you mean by server to server.
URLs are fine to use to access an HTTP server, but the host name will need to be resolved into an IP address before a network connection can actually be established. You should be able to find libraries that will do those details for you, but it is not hard to manually establish a socket connection to an HTTP server.
There are configurations where there are multiple servers, acting as a single server. These are sometimes referred to as web farms or a HTTP cluster. Typically, there is some sort of load balancer in front of the cluster. Many HTTP load balancers support a server affinity feature to make sure a client is sent to the same server in the cluster for subsequent operations.
In a cluster configuration, servers may need to synchronize shared state, such as file system data or configuration data. This is typically handled by some mechanism that is external to the HTTP server process itself. The HTTP server process may need to cooperate with the synchronization, but this can be as simple as restarting the process.
There is another mode of HTTP server configuration called a reverse proxy configuration. A cluster of HTTP proxy servers sit in front of a single HTTP server. The proxy servers are thought to be cheap and expendable entities that off load work from the HTTP server itself, providing a scalable means to increase HTTP server capacity.
There are many open source HTTP server and proxy projects available as examples of how they are implemented. If you are trying to build your own custom server application, you can have a look at the HTTP examples in Boost asio.