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Async HTTP Request from Automation script?

Solved1.02K views19th January 2023Automation
6
Robin Becker [DevOps Advocate]1.40K 18th January 2023 0 Comments

Would it be possible to do send an async HTTP request from an automation script? For example using the HttpClient-class? I want to call an external API based on a correlation rule.

I've tried experimenting a bit, including using sub-scripts but I can't really get any output.

Is there some other best-practice?

Robin Becker [DevOps Advocate] Selected answer as best 18th January 2023

1 Answer

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Jens Vandewalle [SLC] [DevOps Enabler]9.44K Posted 18th January 2023 3 Comments

Hi Robin,

I've used below code in the past to send a async HTTP request

public class Script
{
private static HttpClient httpClient = new HttpClient();

public void Run(Engine engine)
{
var result = GetResult();
}

private static myClass GetResult()
{
var response = httpClient.PostAsync(new Uri("url"), content).Result;

var responseBodyJson = response.Content.ReadAsStringAsync().Result;
var jsonObject = JsonConvert.DeserializeObject<myClass>(responseBodyJson);

return jsonObject;
}
}

Robin Becker [DevOps Advocate] Posted new comment 19th January 2023
Robin Becker [DevOps Advocate] commented 18th January 2023

It was the .Wait-function that solved it, thanks Jens!

Jens Vandewalle [SLC] [DevOps Enabler] commented 19th January 2023

Hi Robin, I’ve made some changes to my code
– HttpClient is now a shared field. See more details for this change in https://www.aspnetmonsters.com/2016/08/2016-08-27-httpclientwrong/
– I don’t use the .Wait function anymore since the .Result function already makes it synchronously. In general automation scripts are executed sequentially, so therefore we should try to avoid async code as much as possible.

Robin Becker [DevOps Advocate] commented 19th January 2023

That makes sense.

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