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AZ-204 · Question #27
Drag and Drop Question You are creating a collaborative image hosting platform as an ASP.NET MVC web application. Users add, update, and modify images on the platform. Images are stored in Azure Blob
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Submitted by kavita_s· Mar 30, 2026Develop for Azure Storage - Implement blob storage operations including concurrency control strategies using ETags and conditional HTTP headers (AZ-204 / Azure Developer Associate)
Question
Drag and Drop Question You are creating a collaborative image hosting platform as an ASP.NET MVC web application. Users add, update, and modify images on the platform. Images are stored in Azure Blob storage. More than one user at a time must be able to modify the same image. You need to implement optimistic concurrency for uploading images. Which four actions should you perform in sequence? To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order. NOTE: Each correct solution is worth one point. Answer:
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Retrieve an image blob from the storage service. The response includes an HTTP ETag header value that identifies the current version of the image(blob).Check response headers. If the status code equals 200, notify that it is a success. If the code is 412m notify the user about a conflicting change.When you upload the image, include the ETag in the If-None-Match conditional header of the PUT BLOB request.Store the ETag of the blob for further use, and let the user make the necessary modifications to the image.When you upload the image, include the ETag in the If-Match conditional header of the PUT BLOB request.
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Topics
#Azure Blob Storage#Optimistic Concurrency#ETags#Conditional Headers