The upload froze the app for 8 seconds.
The fix is the cheapest queue Azure sells, and a pointer instead of a payload.
What you'll learn
- Why image processing inside the request exhausts the web tier
- The claim check: put a blob path on the queue, not the file
- How visibility timeout and DequeueCount handle a dead worker
Share this passage
Drawing…
Understand it one step at a time
The short runs these in order in about 32 seconds. Here they are written out — pick any step to jump the short straight to it.
Upload. Then nothing happens
A 4.2 MB photo uploads and the screen just hangs. No progress bar, no response — because the API hasn’t returned yet.
Frequently asked questions
- Why move image processing out of the upload request?
- Processing the image inline holds a web-tier thread and the user's connection open for the whole operation — do that under load and you exhaust the web tier's capacity. The upload request should end as soon as the answer the user needs — upload succeeded — is known.
- What is the "claim check" pattern used here?
- Upload the image to blob storage, then put only a small message (the blob's path, here 182 bytes) on the queue — not the file itself. A background worker picks up the message and does the processing, and visibility timeout plus DequeueCount handle a worker that dies mid-job.
Free app · no app store
These are built for a phone
Every short is drawn at full portrait height, the shape a phone already is. Installed, it opens full-bleed with no address bar across the top — and the whole library reads offline.
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