topic Re: Getting headers sent to my app? in G Web Development Software

Getting headers sent to my app?

bhpowell — Sat, 11 Dec 2021 15:35:17 GMT

I think I'm missing something obvious.

Is there a way to get the headers of the request that invokes my app's web pages?

Perhaps there's some way to open a client handle to "this request"?

In particular, I'd like to know what the "Host:" header is, so I can know what host I'm running on.

Is there another way to do this?

Re: Getting headers sent to my app?

MilanR — Thu, 16 Dec 2021 05:00:41 GMT

Are you referring to the following scenario:

You are making HTTP requests in a WebVI using relative URLs so you are not aware of the host, ie GET /mydata
You want to get the HOST of the HTTP Requests that your WebVI is making to other servers

In that scenario the HOST that is used in the HTTP request is the same as what is shown in the URL for the current page. You can use the URL for WebVI library to get the parts of the URL for the page. The demo shows how the library can get the current URL of a page and parse and return the host portion of the URL.

Re: Getting headers sent to my app?

bhpowell — Thu, 16 Dec 2021 20:17:17 GMT

Hi, Milan. Thanks for the response.

The VIs you linked to are indeed useful, but I'm not sure they solve my problem.

To answer your question, suppose I build an app called "MyWebApp" and install it in htdocs of the NI Web Server.

If I'm invoked as http://myserver.stravaro.com/MyWebApp, I'd like to have MyWebApp's code be able to know that it is running on "http://myserver.stravaro.com".

This information is part of the headers with which my web app is called, but I'm not sure how to retrieve those headers.

Re: Getting headers sent to my app?

bhpowell — Thu, 16 Dec 2021 20:41:43 GMT

I spoke too soon. You have a VI named "Window Location Get.gvi" which does what I want. (Especially if I use it with "URL Get Parts.gvi".)

I really didn't expect the function to be named "Window Location Get.gvi". This seems like it should be referring to the window geometry in the GUI.

Re: Getting headers sent to my app?

MilanR — Thu, 16 Dec 2021 21:22:08 GMT

Ah yea, it was named pretty directly after the underlying JavaScript property that is being accessed, ie the location property of the window object. I can see how the name could be misconstrued for the window geometry 😋