[core-rest-pipeline] await prepareFormData() (#23858)

We should wait for the Promise to resolve
Azure · Nov 23, 2022 · 565acec · 565acec
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diff --git a/sdk/core/core-rest-pipeline/CHANGELOG.md b/sdk/core/core-rest-pipeline/CHANGELOG.md
@@ -8,6 +8,8 @@
 
 ### Bugs Fixed
 
+- Fix an issue in `FormDataPolicy` where we are not waiting for `prepareFormData()` to complete [PR #23858](https://github.com/Azure/azure-sdk-for-js/pull/23858)
+
 ### Other Changes
 
 ## 1.10.0 (2022-11-03)

diff --git a/sdk/core/core-rest-pipeline/src/policies/formDataPolicy.ts b/sdk/core/core-rest-pipeline/src/policies/formDataPolicy.ts
@@ -23,7 +23,7 @@ export function formDataPolicy(): PipelinePolicy {
           request.body = wwwFormUrlEncode(request.formData);
           request.formData = undefined;
         } else {
-          prepareFormData(request.formData, request);
+          await prepareFormData(request.formData, request);
         }
       }
       return next(request);