Essentially what my use case is, a 3rd party server only support POST on a specific integration url. but I want a browser to hit it from a normal html link (I have no control over either systems code, I can only configure the destination url for the link)
To solve or this I have written a web hosted app (done in Mirth Connect - but the server tech in theory shouldn't matter). The objective of my app is to cat the GET and convert it to a POST
My systems logic:
My web server receives an HTTP GET from a browser, grabs the query strings.
The server then performs an HTTP POST on a 3rd party server, and grabs the html result
The server then returns the original html and delivers it as the result to the original http request from the browser
This works great, the issue comes in with content hosted on the 3rd party server that is referenced with a relative path (css, js, images, etc).
Because I have "tricked" the browser into thinking it received the html from my system, it looks on my server for the content (which will all 404).
Without having to handle the fetching of all the content myself, is there a way to tell a browser to redirect all further queries to the 3rd party server?
I tried making my HTTP GET return a status 301 or 302 with the location being the base address of the 3rd party server, but this obviously tells the browser to redirect completely
Figured it out.
I just had to intercept the html and inject a BASE tag .
Related
This is most likely a repeated question.
The closest I got to an answer was here: execute a Nodejs script from an html page?
Yet, I still can't understand.
So here's the situation:
I have an express server setup with the following files:
Express App
server.js
index.html
and right now I want the html folder to have a button, that calls a function set in the node.js file.
Tell me if more information is needed, thanks!
EDIT:
Im remaking the question to be more clear.
I am using an express server to present a website, that present a button saying " Power Off", I want this button to be able to execute an action on my server computer, that action being a terminal command to power it off.
I wanted to know how could I make said button, written in HTML, hosted on the server but presented to the client, to interact with the server.js file hosted on the server, which would have a function set to execute said command.
thanks!
You need to understand a little better how the client/server architecture of a web page works and where code actually runs and how the client and server communicate with one another.
You can't call a function directly on your node.js server from an HTML file. The HTML file is in the client's browser. The node server is your web server, far away from the client's browser on different computers. Though it may seem like your HTML is on your node.js server because it's in a directory on that server, that's only where it is stored. When the browser requests that page, your node.js server sends the HTML to the client's browser and it is rendered back in the client browser and that's where the Javascript in that page runs (in the client's browser, far away from your node.js server). This is a client-server architecture. The HTML page is running on the client. The node.js server is on your server - different computers.
If you want to communicate with the node.js server from the web page, then you use Javascript in the HTML page to make an Ajax call from the Javascript in the web page to the node.js server (An Ajax call is an http request). You then configure a route in the node.js server for that specific Ajax call and you can then write code in node.js to do whatever you want to happen when that Ajax call is received. It can carry out some operation on the server, it can retrieve data and return it to the client, etc... You can optionally send data with the Ajax call (either as query parameters for a GET request or as body data for a POST request) and then the server can optionally return data back to you (often as JSON, but it can be any format you like).
I'm not an expert with Node, but I think what's happening here is blurring the lines between server and client. Even though both use JavaScript, there's a distinction. NodeJS could easily be replaced with Ruby, PHP, Java, whatever-backend-language-you-like, and this distinction would apply in the same way it does when you use JavaScript on the server. There's no differerence.
Server-side code executes on the server. Client side code executes on the client (the browser). If you need to call a NodeJS function (assuming it has to interact with the other server side code such as databases etc) then you can send a request, either via AJAX or standard HTTP, to the a route on the server and call that function within the route.
On the other hand, if the function is generic enough and doesn't involve any specific Node code then you can simply add a script tag with your JavaScript file to the index.html page.
There is a difference between server and client. You cannot just call a function on a server from a client directly, there is more to just that. If you wanted to, you could do it by routing a path to wherever and making an HTTP request to that path, or even, using other protocols like WebSocket if you need to communicate both ways.
First I must explain I am a total newbie with regards to web design.
My question is as follows:
I would like to have a remote URL displayed through a different web server. The remote URL resides on an internal firewalled server and I would like to give public access to a single page by displaying it on a remote web server that has access to the firewalled page. I have tried iframes but they use the clients IP which results in the page failing to display. I have limited access to the server (CPanel) - please advise how this is possible? The remote URL will be requiring a login - not sure if this will have relevance on the solution.
What you can do is create a page which makes a request to the firewalled page using either CURL or HttpWebRequest or any compatible technology based on the platform you have chosen. It can then trim out the headers and other tags which are not required and render the html in a div, or it can just redirect the entire code in the response of your page.
This way, there will be no connection made from the client end, just your server will connect to your firewalled server and fetch the page from there and in turn give it back.
The only problem here is, forms - images and linked objects might not work properly, you might also have to parse them and replace the respective urls to point to your server which in turn proxyfy it.
Here is an example of it
https://proxify.net/
I have to load data for a different url the page will run on the android browser and will load content from remote server .
I have to use dojo so I tried with dojo.xhrGet , it does'nt load the data so when I red the reference guide I saw that that method has some limitation with external url's .
So what I have to do now if I have to call a REST service with dojo .
the REST service URL on the remote server:
http://192.168.1.65:9080/RAD8JAX-RSWeb/jaxrs/customers/accounts/111-11-1111/
and the data that I should see
[{"id":"001-111001","balance":12345.67},{"id":"001-111002","balance":6543.21},{"id":"001-111003","balance":98.76}]
please help me with a method that can fix my problem I dont know dojo well I'm blocked right now because I can't use the data between two application they can't communicate
Your question is unclear, but I think you are saying you want to load data from a different domain to the main web page.
You cannot reliably use AJAX to load data from anywhere other than the domain of page you are visiting.
Almost all modern internet browsers deliberately block that, for the protection of their own users.
Instead, you will need to find some way of getting your server to relay the information.
So imagine currently you do:
Load page a.example.com/index.html
Page uses dojo to try to load b.example.com/data
You would instead need to do:
Load page a.example.com/index.html
Page uses dojo to try to load a.example.com/data
When the a.example.com server receives a request to load /data, it should connect (perhaps using cURL) to b.example.com/data and then output the same text.
Not 100% sure if this is the right SE site to ask this, so feel free to move/warn me.
If I have a site www.mysite.com with a form on it and define its action as "http://www.mysite.com/handlepost" instead of "/handlepost", does it still get parsed as a local address by apache? That is, will apache figure out that I'm trying to send my form data to the same server the form resides on and do an automatic local post, or will the data be forced to make a round trip, going online, looking up the domain and actually being sent as an outside request?
Apache does not look at this information. It's your browser which does this job.
On the Apache side the job is only outputing content (html in this case), apache does not care about the way you write your url in this content.
On the browser side the page is analysed and GET requests (images,etc) are sent automatically to all collected url. The browser SHOULD know that relative url /foo are in fact http://currentsite/foo - or it's a really dump browser -. It is his job. And then it's his job to push the request to the right server (and to known if he should make a new DNS request, build a new HTTP connection, reuse an existing opened connection, build several connections -- usually max 3 conn per DNS--, etc). Apache does nothing in this part of the job.
So why absolute url are bad? Not because of the job the browser should have to do handling it (which is in fact nothing, his job is transforming relative url to absolute ones); It's because if your web application use only relative url the admin of the web server will have far more possibilities on proxying your application. For example:
he will be able to server your web application on several different DNS domains
(and then make the browser think he's talking to several servers, parallelizing static files downloads)
he could as use use this multi-domain to set up the application for different costumers
he could build an HTTPS access for external network access and an HTTP (without the S) access on a local name for the local network
And if your application is building the absolute url these tasks will become really harder.
dont use absolute URL's . As i feel it will do a round trip in your case as you have used round trip for the action part. so better use releative URL's
I'm currently using CyberNeko in an attempt to grab information I want from a website. However, I believe the website checks the user agent/browser version to keep from just grabbing the url content.
I am aware of using htmlunit to change the browser version, but not sure if I can go about this using CyberNeko.
Does anyone know if it's possible to do such a thing?
I've never used CyberNeko, but I thought it was just a HTML parser, i.e. I didn't think you could use it to issue the HTTP requests and actually download the web page.
It could be the fact that the HTTP request issued by CyberNeko is missing various headers such as the user agent header. An easy way to ensure that the HTTP request looks like a request sent from a browser is to use HttpClient instead of CyberNeko to download the web page. There's some example code available here.
Once you've successfully downloaded the page, use CyberNeko to parse out the bits you're interested in.