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Fix bad request for multipart form data with boundary split (#2159)

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* Add test for multipart form data with boundary split

Add a test for multipart form data requests with a large header which
leads to a split inside the boundary because of the read buffer size
inside the SocketStream class.

* Fix bad request for multipart form data with boundary split

Fix a bad request (400) response for multipart form data requests with
a large header which leads to a split inside the boundary because of the
read buffer size inside the SocketStream class. The parse function
inside the MultipartFormDataParser wrongly erase the receive buffer if
it doesn't find the boundary inside the buffer during first call.
This commit is contained in:
herbrechtsmeier
2025-06-24 18:57:32 +02:00
committed by GitHub
parent b6c55c6030
commit de5a255ac6
2 changed files with 57 additions and 4 deletions
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7
httplib.h
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@ -5028,10 +5028,9 @@ public:
while (buf_size() > 0) {
switch (state_) {
case 0: { // Initial boundary
buf_erase(buf_find(dash_boundary_crlf_));
if (dash_boundary_crlf_.size() > buf_size()) { return true; }
if (!buf_start_with(dash_boundary_crlf_)) { return false; }
buf_erase(dash_boundary_crlf_.size());
auto pos = buf_find(dash_boundary_crlf_);
if (pos == buf_size()) { return true; }
buf_erase(pos + dash_boundary_crlf_.size());
state_ = 1;
break;
}