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bug passing a % sign to uri-common / spiffy

From: masukomi
Subject: bug passing a % sign to uri-common / spiffy
Date: Mon, 3 Jan 2022 23:20:08 -0500

I'm working on a small webapp with a JSON api. I've stumbled across a bug where I can't POST JSON with a % sign in it or it'll blow up.

for example if i POST this json:

"foo": "%"

i get this stack trace
[Mon Jan  3 23:08:44 2022] "POST http://localhost:5749/json/sanity-check/ HTTP/1.1" Error: (string->symbol)
bad argument type - not a string

[bunch of irrelevant stuff]
router.scm:249: intarweb#read-urlencoded-request-data
spiffy.scm:509: k625
spiffy.scm:497: g628
spiffy.scm:511: handle-exception
spiffy.scm:512: chicken.port#with-output-to-string

(router.scm is mine)

Unfortunately that section of spiffy is a long and complex method and the error handler is surrounding a LOT of functionality, so it's not clear to what's blowing up.

I tried bringing the uri-common.scm (since it seems plausible that this is a decoding issue) and spiffy.scm into my project and compiling them into the app (one at a time) but I always end up with this error:

Error: during expansion of (import-syntax ...) - unbound variable: ����

I'm happy to debug things but I could really use some help. Maybe if someone could tell me the magic incantation to include a file from an egg without that error so that I could then start breaking it down and eliminating problems?

Any insight would be appreciated.

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