append("; filename=")
              appendQuotedString(filename)
            }
          }

        val headers =
          Headers
            .Builder()
            .addUnsafeNonAscii("Content-Disposition", disposition)
            .build()

        return create(headers, body)
      }
    }
  }

  class Builder
    @JvmOverloads
    constructor(

      value: String,
    ) = commonAdd(name, value)

    /**
     * Add a header with the specified name and value. Does validation of header names, allowing
     * non-ASCII values.
     */
    fun addUnsafeNonAscii(
      name: String,
      value: String,
    ) = apply {
      headersCheckName(name)
      addLenient(name, value)
    }

    /**
     * Adds all headers from an existing collection.

  }

  @Test
  fun headersBuilder() {
    var builder: Headers.Builder = Headers.Builder()
    builder = builder.add("")
    builder = builder.add("", "")
    builder = builder.addUnsafeNonAscii("", "")
    builder = builder.addAll(headersOf())
    builder = builder.add("", Date(0L))
    builder = builder.add("", Instant.EPOCH)
    builder = builder.set("", "")
    builder = builder.set("", Date(0L))