Hi, with 3.0.0 RC1, Is there any workaround for `Multipart part content length limit of 65536 exceed...

# ktor

[Rok Oblak]

Hi, with 3.0.0 RC1, Is there any workaround for Multipart part content length limit of 65536 exceeded?

client:

setBody(MultiPartFormDataContent(formData {
          ..
         append("file", ChannelProvider(bytes.size.toLong(), { ByteReadChannel(bytes) }), ...)

server:

call.receiveMultipart().forEachPart { ...

(crashes in forEachPart)

I see something related but not sure if it is 100% the same:
https://youtrack.jetbrains.com/issue/KTOR-7356

[Bruce Hamilton]

call.receiveMultipart(formFieldLimit = BIG_NUMBER)

[Rok Oblak]

Missed that, thank you!

[Bruce Hamilton]

I've upped the limit for next version and included a better exception when it's hit, since this seems like it could be a common source of consternation 👍

[gavvvr]

Hi @Bruce Hamilton. I migrate to Ktor 3.x and faced this "updated" 50 Mb limit coming from default argument of receiveMultipart() . Then I wanted to build a plugin which would apply large limit on receiveMultipart() for the whole app, for example by putting desired value to FormFieldLimit attribute onCall {}. But the default value of formFieldLimit argument (those 50 Mb) overrides the value from the attribute. So, right now I don't see any way to implicitly apply upload file size limit with a plugin, you must always explicitly pass the desired limit as an argument to receiveMultipart(). Don't you think there should also be an attribute for multipart content, similar to existing FormFieldLimit ?

[Bruce Hamilton]

Oh, looks like an oversight. The FormFieldLimit attribute ought to set the value.

[Bruce Hamilton]

Logged a bug for the next patch https://youtrack.jetbrains.com/issue/KTOR-7946/FormFieldLimit-is-overwritten-by-default-arg

[gavvvr]

Thank you @Bruce Hamilton! Another question then: Shouldn't the val FORM_FIELD_LIMIT be publicly available to avoid constructing my own AttributeKey<Long>("FormFieldLimit") object and re-typing attribute name, if I want to put another value?