The Solution#238
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Review Summary
The implementation has one critical bug that will cause the compression server to always fail. In src/index.html at line 99, the select field uses name="compressSelector", but the task requirement explicitly states it must use name="compressionType". The server code at src/createServer.js lines 75-77 reads fields.compressionType, so when the form is submitted, the server receives undefined for the compression type and returns a 400 error.
To fix: Change the name attribute from "compressSelector" to "compressionType" on the select field in index.html.
The rest of the implementation is solid—stream handling with zlib, proper error responses (404/400), correct file extension handling (.gz, .dfl, .br), and the Content-Disposition header are all implemented correctly. Once you fix this one attribute, the form should submit and compress files as expected.
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Footnotes
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The select field must have name="compressionType" to match the task requirement and server expectations. Currently it has name="compressSelector" which will cause the compression type not to be received correctly by the server.
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| <label class="label"> | ||
| <span>Choose a compression type:</span> | ||
| <select class="selector" id="compressSelector" name="compressSelector" required> |
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The select field must have name="compressionType" to match the task requirement. Currently it uses name="compressSelector" which causes the server's form parser to receive undefined for fields.compressionType, triggering a 400 error response.
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Pull request overview
Note
Copilot was unable to run its full agentic suite in this review.
Adds a simple Node.js HTTP server and UI for uploading a file and downloading a compressed version (gzip/deflate/brotli), along with basic styling and CI scaffolding.
Changes:
- Implemented
/and/compressroutes with multipart upload parsing and streaming compression. - Added a static HTML page (with embedded styling) and added a separate CSS stylesheet.
- Updated tooling version and added a GitHub Actions test workflow template.
Reviewed changes
Copilot reviewed 5 out of 6 changed files in this pull request and generated 6 comments.
Show a summary per file
| File | Description |
|---|---|
| src/styles/styles.css | Adds standalone CSS styles for the compressor UI. |
| src/index.html | Adds the upload/compression UI and embeds CSS in a <style> block. |
| src/createServer.js | Implements HTTP server routes, form parsing, and compression streaming. |
| package.json | Updates @mate-academy/scripts dependency version. |
| .github/workflows/test.yml-template | Adds a CI workflow template for running tests on PRs. |
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| const compressionType = Array.isArray(fields.compressionType) | ||
| ? fields.compressionType[0] | ||
| : fields.compressionType; |
| response.writeHead(200, { | ||
| 'Content-Type': 'application/octet-stream', | ||
| 'Content-Disposition': `attachment; filename=${filename}.${extension}`, | ||
| }); |
| const { createStream, extension } = compressionTypes[compressionType]; | ||
| const readStream = fs.createReadStream(filePath); | ||
| const compressStream = createStream(); |
| <style> | ||
| body { | ||
| font-family: 'Arial', sans-serif; | ||
| margin: 0; | ||
| padding: 0; | ||
| background-color: #f5f5f5; | ||
| } | ||
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| .container { | ||
| width: 80%; | ||
| margin: 0 auto; | ||
| padding: 0; | ||
| display: flex; | ||
| height: 100vh; | ||
| flex-direction: column; | ||
| align-items: center; | ||
| justify-content: center; | ||
| } | ||
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| .mainTitle { | ||
| text-align: center; | ||
| color: #333; | ||
| } | ||
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| .mainDescription { | ||
| text-align: center; | ||
| color: #666; | ||
| margin-bottom: 40px; | ||
| } | ||
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| .form { | ||
| display: flex; | ||
| flex-direction: column; | ||
| align-items: center; | ||
| gap: 20px; | ||
| } | ||
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| .label { | ||
| display: flex; | ||
| flex-direction: column; | ||
| gap: 10px; | ||
| font-size: 18px; | ||
| color: #333; | ||
| } | ||
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| .fileInput { | ||
| padding: 10px; | ||
| border: 1px solid #ccc; | ||
| border-radius: 4px; | ||
| background-color: #fff; | ||
| cursor: pointer; | ||
| } | ||
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| .selector { | ||
| padding: 10px; | ||
| border: 1px solid #ccc; | ||
| border-radius: 4px; | ||
| background-color: #fff; | ||
| cursor: pointer; | ||
| } | ||
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| .submitBtn { | ||
| padding: 10px 20px; | ||
| border: none; | ||
| border-radius: 4px; | ||
| background-color: #007bff; | ||
| color: #fff; | ||
| font-size: 16px; | ||
| cursor: pointer; | ||
| } | ||
| </style> |
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| on: | ||
| pull_request: | ||
| branches: [ master ] |
| - uses: actions/checkout@v2 | ||
| - name: Use Node.js ${{ matrix.node-version }} | ||
| uses: actions/setup-node@v1 |
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Review Summary
Your implementation is complete and correctly meets all task requirements. The critical bug identified in previous reviews has been resolved—the select field in src/index.html now uses name="compressionType" which properly matches what the server expects at src/createServer.js lines 75-77. All functional requirements are satisfied: the form posts multipart data to /compress, the server uses zlib with stream piping for compression, proper error handling returns correct status codes (404 for unknown endpoints, 400 for invalid requests, 200 for successful compression), and file extensions are correctly appended (.gz, .dfl, .br). All checklist items pass, and no test failures are reported. Excellent work on this implementation!
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
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