The correct answer is to generate a SAS token for the user to upload directly to Blob Storage. This approach keeps the App Service responsive because the SAS token enables client-side direct upload to Azure Blob Storage, bypassing the web server entirely; without it, every image would stream through the App Service, consuming its limited HTTP threads and causing bottlenecks under load. On the AZ-204 exam, this scenario tests your understanding of offloading compute-bound or I/O-heavy operations to Azure services, often disguised as a choice between server-side uploads, Azure Functions, or queue-based processing—the common trap is overcomplicating the solution when a simple delegated access token suffices. Remember the key principle: if the client can talk directly to the storage endpoint, let it. Memory tip: “SAS sends the stress to Storage, not the server.”
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are developing a web application that allows users to upload images. The application runs on Azure App Service. You need to ensure that uploaded images are stored in Azure Blob Storage and that the application remains responsive. What should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Generate a SAS token for the user to upload directly to Blob Storage.
Option B is correct because generating a SAS token allows the user's browser to upload images directly to Azure Blob Storage without routing the data through the App Service. This keeps the web application responsive by offloading the upload workload to Azure Storage, avoiding blocking the App Service's limited HTTP request threads and reducing latency.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Upload the image to the App Service and then copy it to Blob Storage.
Why it's wrong here
This adds latency and uses server resources; direct upload is better.
✓
Generate a SAS token for the user to upload directly to Blob Storage.
Why this is correct
SAS tokens allow secure, direct uploads without burdening the app server.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Azure Files for image storage.
Why it's wrong here
Azure Files is for file shares, not optimized for image uploads.
✗
Make the Blob container public for anonymous uploads.
Why it's wrong here
Public containers are insecure and allow anyone to upload.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume all uploads must go through the App Service (Option A) because they think the app must 'own' the data first, missing the SAS-based direct upload pattern that Azure Blob Storage explicitly supports for offloading work.
Detailed technical explanation
How to think about this question
Under the hood, a SAS token is a URI that grants delegated access to a specific Blob Storage resource (container or blob) with granular permissions (e.g., create, write) and an expiration time. The web app generates the SAS server-side (using the Azure Storage SDK) and returns it to the client, which then uses the Azure Blob Storage REST API (PUT Blob) to upload directly. This pattern is often called 'client-side upload' and is critical for high-scale apps because it avoids saturating the App Service's outbound connections and keeps the frontend stateless.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Generate a SAS token for the user to upload directly to Blob Storage. — Option B is correct because generating a SAS token allows the user's browser to upload images directly to Azure Blob Storage without routing the data through the App Service. This keeps the web application responsive by offloading the upload workload to Azure Storage, avoiding blocking the App Service's limited HTTP request threads and reducing latency.
What should I do if I get this AZ-204 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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