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I am trying to call Tosca's rest api from my server and it's giving me this exception: 'access-control-allow-origin'. Since I have no control over Tosca's response, is there a way to get around this exception?

arn-arn
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1 Answers1

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Most likely the issue is not related to Tosca REST API, rather is a CORS problem. So, I am assuming your web server and the Tosca REST API server are on different domain. You can basically bypass this problem by allowing cross-origin requests from the web application, by adding the following configuration to the web.config 

<system.webServer>
<httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Headers" value="Content-Type" />
    <add name="Access-Control-Allow-Methods" value="GET, POST" />
    <add name="Access-Control-Allow-Origin" value="*" />
  </customHeaders>
</httpProtocol>
</system.webServer>
Atanu Roy
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  • thanks Atanu. However, I have no control over the web app. But thanks for the info. I will see if i can ask the owner of the web app to update the web.config. – arn-arn Nov 20 '17 at 16:47
  • @arn-arn Just as an update : if your app is hosted in MS Azure cloud, you can do the CORS configuration directly from Azure management portal. – Atanu Roy Nov 21 '17 at 13:04
  • thanks again Atanu. Unfortunately, that's not our setup. However, i was able to go around it by using java backend which does not throw the pre-flight error. Then my front end just calls my java backend which I can configure myself. – arn-arn Nov 22 '17 at 17:37