Hey, I need to get the value of one of the attribute in response header. The request is sent using the script in pre-req. The error message that I receive is “There was an error in evaluating the Pre-request Script: Error: Cannot read property ‘headers’ of undefined”. I am using “pm.response.head…

Hi @baljindernohra , Welcome to community :wave: Kindly refer the below post which has a similar question and check if this answers your question. [image] Access Response Headers with Postman Tests 🌱 Just Getting Started Hi, Is there a way to access the Response Headers …

Hey @baljindernohra , welcome! This can certainly seem tricky since you’re using pm.sendRequest to send your request instead of as a “proper” postman request. You are going to have to use the response variable from your callback instead of pm.response to get what you want. Take this example of call…

Hey @allenheltondev , Thanks for coming back with the solution. It worked and resolved my issue. Also , is there a way to not send the request if the pre-req script fails for a known reason.

When the prerequest script is running, it’s too late to skip execution. But something you can do (and I do this in my collection workflows) is if you determine you do not want to run that request, you can programmatically set the request url to something else. So what I do is add this in my prerequ…

Hi @allenheltondev , Thanks for the solution. Also is there a way to read the request header value for a request that is getting sent in the pre-req script.

Yes, if you just use pm.request.headers.get('myHeaderName') you can get access to a specific header in the main request.

@allenheltondev I have tried that and its not working for the request that is sent in the pre-req script. It returns “undefined” in the console. Although the header name is correct.

Oh you’re talking about a header in the pm.sendRequest function in the pre-request script? I am confused. If that’s what you want, you know exactly what those headers are in the request because you defined them. You build the headers, url, method, and body when you use that function. I might be ab…

@allenheltondev So in the pre-req, i am hitting three endpoints. First GET request gives me an endpoint in the response header, which becomes the next GET request(Highlighted in red). The request headers for this call are pre populated. I need to extract the “Cookie” from this call, which is used in…

How are the request headers pre-populated? This is the part that I’m missing.

Unable to read header value for a request that is sent in Pre-req

Help Hub

maintenance-enginee2 (Anuj Agrawal) June 20, 2022, 3:32pm 17

Did we find a solution here? I am facing the same issue @baljindernohra / @allenheltondev

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Unable to read header value for a request that is sent in Pre-req

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