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bug: wrong trailer format parsing #295

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kingluo opened this issue Apr 11, 2023 · 0 comments
Open

bug: wrong trailer format parsing #295

kingluo opened this issue Apr 11, 2023 · 0 comments

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@kingluo
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kingluo commented Apr 11, 2023 •
edited

The trailer headers should be in the following format:

...<body>...
0\r\n
Trailer-Header-A: foo\r\n
...
\r\n

However, the code thought there is an extra \r\n between 0\r\n and Trailer-Header-A: foo\r\n, so it consumes two more chars from the first header at the end of chunked body parsing, then the first parsed header becomes a truncated version: ailer-Header-A: foo\r\n.

lua-resty-http/lib/resty/http.lua

Lines 486 to 489 in 4ab4269

else
-- Read the last (zero length) chunk's carriage return
sock:receive(2) -- read \r\n
end

lua-resty-http/t/04-trailers.t

Lines 79 to 86 in 4ab4269

table.insert(res, body)
table.insert(res, "0")
table.insert(res, "")
table.insert(res, "Content-MD5: " .. ngx.md5(body))
table.insert(res, "")
table.insert(res, "")

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@kingluo