A multipart message with the boundary string inside the body fails parsing

[calvincestari]

If given the following multipart message the parser will incorrectly split the chunk and throw a parsing error.

--graphql
Content-Type: application/json

{
  "data": {
    "field1": "value1--graphql"
  }
}
--graphql--

[calvincestari]

First part of the fix for this is apollographql/apollo-ios-dev#491

[github-actions]

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