Baseline Widely available
The HTTP SourceMap
response header provides the location of a source map for the resource.
The HTTP SourceMap
header has precedence over a source annotation (sourceMappingURL=path-to-map.js.map
), and if both are present, the header URL is used to resolve the source map file.
SourceMap: <url>
X-SourceMap: <url> (deprecated)
Directives
<url>
A relative (to the request URL) or absolute URL pointing to a source map file.
The following response contains an absolute path in the SourceMap
header.
HTTP/1.1 200 OK
Content-Type: text/javascript
SourceMap: /path/to/file.js.map
<optimized-javascript>
Developer tools use the source map to reconstruct the original source from the optimized JavaScript returned in the response, allowing developers to debug the original code rather than the format that has been optimized for sending.
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HTML:
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UTF-8
| Version:
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