Siemens 1500 LHTTPget and post api

[stu]

Hi
I’m struggling to understand how the LHTTP_post / get work ?
I have a url address given to me by the IT , I have to send a works order
number to api and then the http sends back 3 valves id1:39000 id2: 300000 id3: 900000

On the LHTTP_post instruction what is the data is that the value I want to send , and the same as the get instruction

I can’t see how to set up the lhttp, any information will help

 

[drbitboy]

You may not need to do a POST if it the HTTP client needs to send only a works order, but you do need the name of the works order that the HTTP server is looking for, e.g. can you connect a regular browser to the URL like this:

• Say the API's URL from IT is
  • http://gmtwo.mycompany.com/work_order
• So you type this into the address bar of a browser:
  • http://gmtwo.mycompany.com/work_order?work_order=1234567890
• and hit enter.

adding the text in blue - what comes back from the server? Presumably they gave you the name of the work order request name.

 

[drbitboy]

In the client/server dialog below, telnet to port 80 (HTTP protocol port) is me being the client.

• I typed (pasted) everything in bold black;
  • the bold black starting with GET comprises
    • my GET request and the associated header,
    • the italics ?b=c&a=b after GET /get is the request data that I added to the request for the basic URL of http://eu.httpbin.org/get
    • with the empty line telling the server that my client request was done;
• the bold magenta is the response header from the server
  
  • with the empty line telling the client that the previous line was the last response header line and the next line will be the first response data line.
• The bold blue is the response data from the server.
  
  • Note that the args element of the response data echos the request data from my GET request

You don't have to code the equivalent of this raw socket dialog, because presumably the LHTTP* library handles most of this for you. But you do have to figure out how to add that work order as part of the GET (or POST) request.

$ telnet eu.httpbin.org 80

Trying 54.85.66.171...

Connected to eu.httpbin.org.

Escape character is '^]'.

GET /get?b=c&a=b HTTP/1.1

Host: eu.httpbin.org

User-Agent: telnet/by-hand

Accept: */*

   <== empty line

HTTP/1.1 200 OK

Date: Mon, 28 Feb 2022 23:30:26 GMT

Content-Type: application/json

Content-Length: 301

Connection: keep-alive

Server: gunicorn/19.9.0

Access-Control-Allow-Origin: *

Access-Control-Allow-Credentials: true

  <== empty line

{

  "args": {

    "a": "b",

    "b": "c"

  },

  "headers": {

    "Accept": "*/*",

    "Host": "eu.httpbin.org",

    "User-Agent": "telnet/by-hand",

    "X-Amzn-Trace-Id": "Root=1-621d5b12-0001054c426e522b3a48ea47"

  },

  "origin": "74.69.97.246",

  "url": "http://eu.httpbin.org/get?b=c&a=b"

}

​