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Simple header validation fails with folded value #15

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kynx opened this issue Sep 11, 2022 · 0 comments
Open

Simple header validation fails with folded value #15

kynx opened this issue Sep 11, 2022 · 0 comments

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@kynx
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kynx commented Sep 11, 2022

If the header value is folded and the continuation line contains leading whitespace:

Subject: Subject Subject Subject Subject Subject Subject Subject Subject Subject
 Subject

the simple header canonicalization strips the leading whitespace on the continuation line:

Subject: Subject Subject Subject Subject Subject Subject Subject Subject Subject
Subject

This leads to an (incorrect) failed validation. According to https://www.rfc-editor.org/rfc/rfc6376#section-3.4.5 the leading whitespace on the continuation line should be preserved.
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@kynx