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kotlinlang

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>

`call.receiveMultipart(formFieldLimit = BIG_NUMBER)`

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 :+1:

Hi <@U0653A2V2QK>. I migrate to Ktor 3.x and faced this "updated" 50 Mb limit coming from <https://github.com/ktorio/ktor/blob/3.0.2/ktor-server/ktor-server-core/common/src/io/ktor/server/request/ApplicationReceiveFunctions.kt#L191|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` ?

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

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

Thank you <@U0653A2V2QK>! 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?