InvokeHTTP errors Name or Service not known

[#1]

I am trying to get census data from census.gov API's, and when I do a GET request using the configured url, I get Name or Service not known error. I am placing the zip code from previous updateAttribute processor in the url. Also, when I just do the same url in postman, I see the response in JSON, but it doesnt work in NIFI. Please help.

[#2]

@Bharath Sudharsanam

Could you please add more details like processor configs screenshot's, Flow and Rest API URL that you are trying to get response from?

[#3]

I added the details as reply. Sorry. please take a look and let me know.

[#4]

This is my Properties of InvokeHTTP. The URL is https://api.census.gov/data/1994/zbp?get=ST&for=zipcode:&{zip}&key=mykey. The Zip attribute is coming from input file that is extracted using evaluateJSONpath and updateAttribute processor before InvokeHTTP. Hope this helps.

[#5]

@ Shu - I added the details as reply. Sorry. please take a look and let me know.

[#6]

@Bharath Sudharsanam

TO get the value of attribute we need to use `${attribute_name}` in NiFi

I am having zip attribute to the flow file,I tried with below as Remote URL in Invoke Http processor and able to get the response back

https://api.census.gov/data/1994/zbp?get=ST&for=zipcode:${zip}

Example:

Flow:

Generateflowfile configs:

Output:

[["ST","zipcode"],
["48","77058"]]

I'm not sure about this &key=mykey parameters in your shared URL. If you are not using them just exclude them from the Remote URL and run again.

[#7]

Shu, I tried now removing the key and still it throws the same error.

[#8]

@Bharath Sudharsanam

Sure,

Invoke HTTP configs:

\

Template for the flow:

Save/Upload the template to your nifi instance and test it out.

211811-invokehttp.xml

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[#9]

@Shu - The config is same as what you have given and still I get the same result. Not sure where the mistake is.

[#10]

@Bharath Sudharsanam

Hmm, If possible please share your flow template (or) all the processors that you are using and configs screenshots of them.