Handling streaming upload with multipart-form data fails with payloads greater than ~7KB

[gcsolaroli]

Describe the bug
When a request with a form field of type 'file' is processed using a StreamingForm, payloads greater than ~7Kb fail.

To Reproduce
Steps to reproduce the behaviour:

1. Clone sample project
2. Run sbt test
3. Two tests should fail:
   • POST largish blob 'data'
   • POST large blob 'data'

Expected behaviour
The code include two different implementation of the code handling the requests, named data and path (matching the two paths where the code is bound to).
The data implementation uses StreamingForm values all around, while path writes down the payload into a temporary file and then uses the content of this temporary file instead of using directly the request payload content.

Some more details are reported into the sample project README file.

Desktop:

• OS: MacOS 14.4.1
• JVM:

  $ java --version
  openjdk 21.0.2 2024-01-16
  OpenJDK Runtime Environment GraalVM CE 21.0.2+13.1 (build 21.0.2+13-jvmci-23.1-b30)
  OpenJDK 64-Bit Server VM GraalVM CE 21.0.2+13.1 (build 21.0.2+13-jvmci-23.1-b30, mixed mode, sharing)

• Scala: 3.4.2

[jdegoes]

/bounty $250

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Attempt	Started (GMT+0)	Solution
🟢 @teserk	Jun 5, 2024, 5:49:02 AM	WIP
🟢 @kyri-petrou		#2882

[teserk]

/attempt #2851

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💡 @kyri-petrou submitted a pull request that claims the bounty. You can visit your bounty board to reward.

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