REST API service when called from azure APIM returning empty response body with Status code 200

Question

I have added my REST api service in Azure API Management. I have followed all the steps given in this link Azure APIM. API works fine in local. It also works when accessed through published URL.

I have added OAuth2.0 security as well which is passing through fine.

My issue is When i try to access the operation through APIM published URL, the service is giving response 200 with empty content.

Can Someone please help.

Do you see forward-request policy statement in efective policy for that operation? — Vitaliy Kurokhtin
– Vitaliy Kurokhtin, Commented Nov 6, 2016 at 9:32
I followed the document and the API works well for me. What's the exact URL you were requesting? Did this API work when you test on the development portal? — Fei Xue
– Fei Xue, Commented Nov 8, 2016 at 11:51
No, even from developer portal I am getting same empty response. I am assuming that my request is not reaching API from APIM at all. — swathi
– swathi, Commented Nov 8, 2016 at 13:36
If you go to management portal, policies, select your product, API and operation and click Show effective policy button, what do you see there? — Vitaliy Kurokhtin
– Vitaliy Kurokhtin, Commented Nov 9, 2016 at 20:09

Darrel Miller · Accepted Answer · 2016-11-29 15:10:07Z

15

This problem occurs when people unintentionally delete the top level policy and remove the main forward-request policy that applies to all operations on all apis. Simply click the Add policy button to re-add the default policy at the top level scope.

answered Nov 29, 2016 at 15:10

Darrel Miller

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2 Comments

Simon W Over a year ago

Have to say that this should be more clearly flagged, especially with the move to the new Portal. Just wasted a couple of hours assuming it was me, only to finally resort to SO...

Darrel Miller Over a year ago

Future guidance: Go to SO first :-) I will forward the feedback though.

brendanrichards · Accepted Answer · 2020-10-06 07:17:10Z

5

Old question, but I'm posting because I had a similar issue (empty response) caused by a different issue:

I was getting empty responses as I had expressions in a policy that read the response. By default, reading the response clears it (presumably because its a stream underneath).

Found some good docs here: https://learn.microsoft.com/en-us/azure/api-management/api-management-transformation-policies#SetBody

I fixed this by specifying "preserve content" when reading the response:

JObject responseJobj = null;
if (context.Response.Body != null) 
{ 
    responseJobj = context.Response.Body.As<JObject>(preserveContent: true); 
}

answered Oct 6, 2020 at 7:17

brendanrichards

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Eric Aya · Accepted Answer · 2022-10-27 14:26:43Z

0

As mentioned, you have deleted some policy rules from all APIs. to fix this,

navigate to the API tab in the Azure portal
click on All APIs
click on edit inbound policies
add forward-request policy inside the backend

edited Oct 27, 2022 at 14:26

Eric Aya

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answered Oct 27, 2022 at 12:36

Hiran

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CPlus · Accepted Answer · 2024-07-09 03:49:17Z

0

If you add this:

<backend>
    <forward-request />
</backend>

It will resolve the issue. This part will forward the request to the URL you set as backend service URL.

edited Jul 9, 2024 at 3:49

CPlus

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answered Jul 8, 2024 at 15:34

Shylesh R

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Rikin Patel · Accepted Answer · 2025-01-06 06:59:08Z

In my case get request working fine but post request retrun 200 but empty response.

so if you have same case then please add cors policy in API management

<policies>
    <inbound>
        <!-- base: Begin Global scope -->
        <cors allow-credentials="true">
            <allowed-origins>
                <origin>http://localhost:4200/</origin>
                <origin>https://developer.mydomain.com</origin>
            </allowed-origins>
            <allowed-methods preflight-result-max-age="300">
                <method>*</method>
            </allowed-methods>
            <allowed-headers>
                <header>*</header>
            </allowed-headers>
            <expose-headers>
                <header>*</header>
            </expose-headers>
        </cors>
        <!-- base: End Global scope -->
    </inbound>
</policies>

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