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This distinction matters because browsers use the HTTP MIME type—not a filename suffix—to decide how to process a response. Set the Content-Type header to describe the representation you actually send, and check the export requirements of the capture tool or reader you plan to use.
First identify what “website capture” means
The phrase can describe three different outputs. They share data, but they do not share one universal MIME type.
A standalone saved page
If the result is one HTML document, use text/html. This is the media type for the page representation itself. A file named page.html should still be served with the correct HTTP header when you make it available over HTTP.
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A folder of downloaded resources
A normal page capture may contain an HTML document plus stylesheets, scripts, fonts, images and data responses. Preserve the type of each resource rather than assigning text/html to every file. The server that replays the capture should emit the original type in each response’s Content-Type header.
An archival package such as WARC
WARC is a container for records. For an HTTP response record, the WARC 1.0 specification says the record-level field should be application/http;msgtype=response. That value identifies the record payload as an HTTP response; it does not replace the payload response’s own media type, such as text/html or image/png. See the IIPC WARC 1.0 specification.
Which MIME type belongs to each captured file?
| Captured content | MIME type | Practical note |
|---|---|---|
| HTML document | text/html |
The page or document markup. |
| CSS stylesheet | text/css |
A stylesheet sent as text/plain may not be applied as CSS. |
| JavaScript | text/javascript |
MDN recommends this current type instead of legacy JavaScript labels. |
| JSON response | application/json |
Use for structured JSON data, including captured API responses. |
| JPEG image | image/jpeg |
Do not infer it from a .jpg name alone. |
| PNG image | image/png |
Use when the bytes are a PNG image. |
| SVG image | image/svg+xml |
SVG is an XML-based image format. |
| WebP image | image/webp |
Use for WebP output. |
| Unknown binary data | application/octet-stream |
Fallback when no more specific type is known. |
| WARC HTTP-response record | application/http;msgtype=response |
Record-layer value, not the page or image type. |
MDN’s MIME types guide explains that the media type describes the nature and format of a resource. Its HTTP basics page lists the common web values above.
Set the HTTP header, not just the extension
The HTTP Content-Type response header describes the representation before content encoding is applied. Compression such as gzip is a separate concern, communicated with Content-Encoding. Do not change the MIME type to reflect compression.
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For example, an HTML response should look conceptually like:
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Content-Encoding: gzip
[compressed HTML bytes]The charset parameter is commonly useful for text. It does not turn an image or WARC record into HTML. MDN documents the header’s semantics in Content-Type.
Why a filename is not enough
Browsers use the MIME type they receive to determine processing behavior, so renaming style.css to style.html does not make it HTML. Conversely, a file named download can still be correctly handled if the server sends its actual type. Some user agents perform MIME sniffing when headers are missing or suspicious, but relying on that creates inconsistent and potentially unsafe behavior. Send an accurate type and, where appropriate, an X-Content-Type-Options: nosniff header.
How to preserve types in a DIY capture
- Record the original response headers. For every URL fetched, save the status, headers and bytes. Keep redirects separate if your archive needs the full chain.
- Store the body without rewriting its format. Do not convert an image to another format while retaining the old type.
- Replay each resource with its recorded type. Serve the HTML response as
text/html, the stylesheet astext/css, and so on. - Separate archive metadata from payload metadata. In WARC, write the record’s
Content-Typeasapplication/http;msgtype=responsefor an HTTP response record, while retaining the embedded HTTP response header that identifies the payload. - Test in the intended reader. Open the replay through HTTP rather than a
file://URL when possible, then inspect the browser’s network panel for blocked or misclassified resources.
Minimal replay examples
For a Python development server, place your captured files in a directory and serve them with a handler that maps extensions or, preferably, recorded metadata:
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from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
class CaptureHandler(SimpleHTTPRequestHandler):
extensions_map = {
**SimpleHTTPRequestHandler.extensions_map,
'.js': 'text/javascript',
'.json': 'application/json',
'.webp': 'image/webp',
'.svg': 'image/svg+xml',
}
ThreadingHTTPServer(('127.0.0.1', 8000), CaptureHandler).serve_forever()Extension mapping is only a fallback. If the original server returned a nonstandard URL or an extensionless resource, use the recorded header instead. Never guess a type from the path when you have the original response metadata.
Common mistakes and fixes
Everything is labeled text/html
Symptom: styles do not apply, scripts download as text, or images fail to render. Cause: the replay server assigned one type to every object. Fix: retain per-response headers and emit the actual type for each resource.
CSS arrives as text/plain
Symptom: the browser refuses to use the stylesheet. Fix: serve it as text/css and verify that the URL is not being redirected to an HTML error page.
JavaScript uses an obsolete label
Symptom: strict policies or tooling warn about the script type. Fix: use text/javascript, the current MDN guidance, and ensure the response body is actually JavaScript.
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Images have the wrong image/* value
Symptom: a decoder reports a corrupt or unsupported image. Fix: inspect the magic bytes or original header, then use the matching type. Do not call a WebP file image/png because its URL ends in .png.
A WARC reader rejects the file
Symptom: the archive parser cannot classify an HTTP response record. Fix: check the WARC record field separately from the embedded HTTP headers and use application/http;msgtype=response for the response record as specified by WARC 1.0.
A blank page appears during replay
Check whether the capture preserved scripts, API responses, fonts and cross-origin headers. A correct MIME type cannot restore a resource that was never captured. Also check CSP, service-worker behavior and URL rewriting in the replay tool.
Capture format, compatibility and security decisions
Choose the output before choosing headers
- Single HTML file: use
text/html; embedded data URLs can eliminate external resource requests but may increase file size. - Self-contained folder: preserve a type for every resource and rewrite references consistently.
- WARC: preserve HTTP exchanges and use the WARC record convention in addition to payload headers.
The cited standards do not define the export requirements of every capture application. If a tool has a proprietary package format, follow that tool’s documentation and confirm what its reader expects. The title does not identify a specific exporter, browser edition or replay library, so an application-specific command cannot be guaranteed here.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsDo not confuse HTTP headers with HTML attributes
An HTTP Content-Type header travels with the response. An HTML element’s type attribute is markup metadata used in contexts such as scripts or links. They are related concepts but are not interchangeable. Set the HTTP header correctly even when the document also contains element attributes.
Or skip the browser setup
If you need a rendered screenshot rather than a standards-preserving archive, ScreenshotNeo returns PNG, JPEG, WebP or PDF from one request. It accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups and chat widgets. Bot checks, CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and response headers identify the page verdict and billing status. Its MCP server provides take_screenshot, get_page_info and capture_pdf tools for Claude, Cursor and other MCP clients.
Use the API with the documented options at ScreenshotNeo’s documentation:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpimport requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo includes full-page and element captures, 12 device presets plus custom viewports, retina scale, dark mode, PDF paper and page-range controls, custom CSS and JavaScript, click and wait actions, request blocking, headers, cookies, user agents, timezone and geolocation, transparent backgrounds, resizing, cache TTLs, signed links, asynchronous webhooks, bulk capture for 100 URLs per call, usage reporting and an OpenAPI specification. Parameters used by other screenshot APIs also work for easier migration.
The Free plan includes 1,000 screenshots per month with no card. Paid plans start at $5 for 3,000 shots; yearly billing provides two months free, and every feature is available on every plan. Sign up for the free plan.
Cost and reliability checks
- For an archive, storage and replay fidelity usually matter more than image format. Keep original headers and bytes so you can diagnose failures later.
- For screenshots, decide whether you need a full page, a selector, a viewport preset or a PDF before setting output options.
- Validate status codes, content length and checksums where reproducibility matters.
- Record redirects, authentication requirements and cache behavior; a successful HTTP status does not guarantee that the body is the intended resource.
Frequently Asked Questions
Should I add a charset to every MIME type?
Use a charset parameter for text representations when the encoding is known, such as text/html; charset=UTF-8. It is not a substitute for an image, binary or WARC record media type.
Is application/octet-stream acceptable for an HTML capture?
Only when the specific format is genuinely unknown. For a known HTML document, send text/html; the generic binary type can cause download behavior instead of normal rendering.
Does WARC replace the original HTTP Content-Type?
No. WARC’s application/http;msgtype=response identifies the archive record layer. Retain the embedded HTTP response and its payload type, such as text/html or image/png.
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