`test_post_and_put` seems to be failing(?)

[DMRobertson]

$ cargo test
    Finished test [unoptimized + debuginfo] target(s) in 0.04s
     Running unittests src/lib.rs (target/debug/deps/matrix_http_rendezvous-2ec065ed56a28c29)

running 8 tests
test tests::test_post_and_get_if_none_match ... ok
test tests::test_post_and_put ... FAILED
test tests::test_post_delete_and_get ... ok
test tests::test_post_and_get ... ok
test tests::test_post_and_put_if_match ... ok
test tests::test_eviction ... ok
test tests::test_monotonically_increasing ... ok
test tests::test_post_max_bytes ... ok

failures:

---- tests::test_post_and_put stdout ----
session: ETag("\"X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=\"")
if_match: IfMatch(Tags(""))
thread 'tests::test_post_and_put' panicked at 'assertion failed: `(left == right)`
  left: `412`,
 right: `202`', src/tests.rs:284:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    tests::test_post_and_put

test result: FAILED. 7 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.22s

error: test failed, to rerun pass `--lib`

From my reading this means that if_match is not None here:

rust-http-rendezvous-server/src/handlers.rs

Line 68 in 48e4da0

if let Some(TypedHeader(if_match)) = if_match {

But that is a surprise, since we do not specify this header here:

rust-http-rendezvous-server/src/tests.rs

Lines 279 to 282 in 182e364

	let request = Request::put(&url)
	.header(CONTENT_LENGTH, 0)
	.body(String::new())
	.unwrap();

$ rustc --version
rustc 1.70.0 (90c541806 2023-05-31)

Something wrong with my setup, maybe?