Logic Apps: HTTP action block not sending "Content-Type" header

Ryan Matthes 16

We have a REST integration running between Microsoft's Logic Apps service (on Azure) and our NetSuite tenant. Logic Apps can perform REST operations to e.g. GET data from external services, such as NetSuite. For NetSuite to respond to the GET request, it needs to know how we want its response returned -- as XML, as JSON, etc. So in the request, I add a "Content-Type" header with a value of "application/JSON". NetSuite can then interpret that and send its data back as JSON.

Unfortunately it doesn't look like Logic Apps is actually sending out the "Content-Type" header, so NetSuite doesn't know how to respond, and our integration fails. I know Logic Apps isn't sending this header because as a test I redirected the request to point to a second Logic App, which just returns any headers it receives. Sure enough, no "Content-Type" header is being returned by that second Logic App. As another test, if I hit the second Logic App with a request sent via Postman, one that I've verified contains a "Content-Type" header, then the second Logic App shows it received my "Content-Type" header. I can only conclude my first Logic App isn't sending out the header I need it to.

This is not documented behavior. In fact as documented, it should be working -- see "Omitted HTTP headers" here: https://learn.microsoft.com/en-us/azure/connectors/connectors-native-http

Johnathan Seal 1 Reputation point

2020-12-06T19:40:54.57+00:00

Hello Ryan,

I am also trying to figure this one out.
I would expect this to be in the httprequestheaders class but I do not see it.
https://learn.microsoft.com/en-us/dotnet/api/system.net.http.headers.httprequestheaders?view=net-5.0

I am calling the TestRail REST API that requires this header.

If I use typescript, I can add the header without issue and the response is as expected.

So, how do I do this with .net 5?
Ryan Matthes 16 Reputation points

2021-01-14T19:25:38.71+00:00

@MayankBargali-MSFT Just noticed I could @ you here! I wrote up a detailed response a few days ago, and noticed someone else chimed in today as well. Do you think you could take a look when you have the time?
Ryan Matthes 16 Reputation points

2021-01-23T18:28:01.303+00:00

@MayankBargali-MSFT Any update at all please?
Johnathan Seal 1 Reputation point

2021-01-24T07:23:35.087+00:00

Hello Ryan,

I found this solution that works.

HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "relativeAddress");
request.Content = new StringContent("{\"name\":\"John Doe\",\"age\":33}",
Encoding.UTF8,
"application/json");//CONTENT-TYPE header

Credit to carlosfigueira on stackoverflow

Ryan, can you please file a document task to get this solution into the knowledge base?

Thanks
Ryan Matthes 16 Reputation points

2021-01-24T17:39:44.343+00:00

I'm sorry, I don't see how this applies to my particular logic app issue. This looks like a C# solution.
Tarun Ahuja 1 Reputation point

2021-07-20T17:48:53.463+00:00

For your GET call add an Accept Header.

Header Name - Accept
Value - application/json

If Netsuite Api is robust enough, it should return you json data.
Nelson Johnson 1 Reputation point

2021-08-30T15:52:02.32+00:00

I tested my logic app using https://postman-echo.com to figure out Content-Type was missing. This is still an issue and if not fixed, will require us to use 3rd party integration tools if MSFT does not address it. Why does MSFT impose their interpretation of the RFC on this when it limits the ability to use it? We are trying to work with a customer that has Java apps that use a framework that requires Content-Type on a GET. I don't care that the documentation says that this is the expected behavior. If we are going to use these tools in real-world applications, then they need to be flexible enough to deal with non-MS systems that have a different implementation. @Pramod Valavala Why not just warn us that the header is not "MS-standard", but still allow it?

6 answers

Tor Arne Gjelhus 1 Reputation point

2021-01-25T20:06:46.77+00:00

Hi

I was facing he same issue and came here for a solution, but then i found this documentation: https://learn.microsoft.com/en-us/azure/connectors/connectors-native-http#known-issues

If i read this correctly logic apps removes content-type among other headers outbound without error.

best regards
Tor Arne Gjelhus
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jrobijn 16 Reputation points

2021-01-25T23:26:58.597+00:00

That same documentation also says it's supposed to make an exception for Content-Disposition, Content-Encoding, and Content-Type. The Content-Type header being removed is clearly not intended behaviour.

Ryan Matthes 16 Reputation points

2021-01-25T23:34:18.673+00:00

@jrobijn Exactly right, this is clearly a bug and this forum is getting us no where. I created a bug here: https://github.com/MicrosoftDocs/azure-docs/issues/69469

Can you please help confirm this bug is real with a comment and help me get a little traction?

Also @Anonymous @Johnathan Seal @Pramod Valavala @MayankBargali-MSFT

Tor Arne Gjelhus 1 Reputation point

2021-01-26T06:01:21.33+00:00

Hi

Sorry seems like i cant read :)

Will confirm the bug.

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Logic Apps: HTTP action block not sending "Content-Type" header

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