fix(envd): serve actual content for procfs/sysfs files with size=0 - #3664
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When stat.Size() returns 0 for virtual files like procfs/sysfs, http.ServeContent uses seek to determine size and sets Content-Length: 0, causing empty responses. The gzip path works because io.Copy streams content directly without seeking. Fix by reading size=0 files into memory (capped at 64 KiB) and serving via bytes.Reader through http.ServeContent, preserving Range/conditional request semantics while returning actual content. Fixes e2b-dev#3363
dajiaohuang
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dobrac and
jakubno
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September 25, 2026 08:34
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Summary
When
stat.Size()returns 0 for virtual files like procfs/sysfs (e.g.,/proc/sys/kernel/random/boot_id),http.ServeContentuses seek to determine size and setsContent-Length: 0, causing empty responses. The gzip path works becauseio.Copystreams content directly without seeking.Fix
Read size=0 files into memory (capped at 64 KiB) and serve via
bytes.Readerthroughhttp.ServeContent, preserving Range/conditional request semantics while returning actual content.Testing
Related issue
Fixes #3363