return buildString {
    append("-----BEGIN CERTIFICATE-----\n")
    encodeBase64Lines(encoded.toByteString())
    append("-----END CERTIFICATE-----\n")
  }
}

internal fun StringBuilder.encodeBase64Lines(data: ByteString) {
  val base64 = data.base64()
  for (i in 0 until base64.length step 64) {
    append(base64, i, minOf(i + 64, base64.length)).append('\n')
  }

  fun escapeForUri(vararg codePoints: Int) =
    apply {
      uriEscapedCodePoints.append(String(*codePoints))
    }

  /**
   * Configure code points to be stripped in conversion to `java.net.URI`. That class is more
   * strict than the others.
   */
  fun stripForUri(vararg codePoints: Int) =
    apply {
      uriStrippedCodePoints.append(String(*codePoints))
    }

  override fun test(
    codePoint: Int,

                if (list.isNotEmpty()) {
                    append("  $name (").append(list.size).append(")\n")
                    append(list.joinToString(separator = "\n    ", prefix = "    ", postfix = "\n"))
                }
            }
        }.toString()

      logger.log(
        buildString {
          append("<-- ${response.code}")
          if (response.message.isNotEmpty()) append(" ${response.message}")
          append(" ${redactUrl(response.request.url)} (${tookMs}ms")
          if (!logHeaders) append(", $bodySize body")
          append(")")
        },
      )

      if (logHeaders) {
        val headers = response.headers

        }
        println("}")
        println()
    }

    private val KClass<*>.typeWithStars: String
        get() = buildString {
            append(simpleName)
            if (typeParameters.isNotEmpty()) {
                append(typeParameters.joinToString(", ", "<", ">") { "*" })
            }
        }

        return buildString {
            appendLine("$expression.map { $parameterName ->")
            appendLine(innerExpression.withIndent(context.increaseIndent()))
            append("}".withIndent(context))
        }
    }

    override fun convertType(type: KType): KType =
        List::class.createType(
            arguments = listOf(
                KTypeProjection(

      // The names are repetitive so re-use the same builder to avoid allocations.
      val fileBuilder = StringBuilder(key).append('.')
      val truncateTo = fileBuilder.length
      for (i in 0 until valueCount) {
        fileBuilder.append(i)
        cleanFiles += directory / fileBuilder.toString()
        fileBuilder.append(".tmp")
        dirtyFiles += directory / fileBuilder.toString()
        fileBuilder.setLength(truncateTo)
      }

        upstreamBuffer.copyTo(sink, 0, bytesRead)
        sourcePos += bytesRead

        // Append the upstream bytes to the file.
        fileOperator!!.write(
          FILE_HEADER_SIZE + upstreamPos,
          upstreamBuffer.clone(),
          upstreamBytesRead,
        )

        synchronized(this@Relay) {
          // Append new upstream bytes into the buffer. Trim it to its max size.

{!../../../docs_src/events/tutorial002.py!}
```

Hier schreibt die `shutdown`-Eventhandler-Funktion eine Textzeile `"Application shutdown"` in eine Datei `log.txt`.

!!! info
    In der Funktion `open()` bedeutet `mode="a"` „append“ („anhängen“), sodass die Zeile nach dem, was sich in dieser Datei befindet, hinzugefügt wird, ohne den vorherigen Inhalt zu überschreiben.

!!! tip "Tipp"

   * known limitations are notably that:

     1. plugin goal execution in a child is usually simply appended (at end): you can't try to insert in the middle of pre-existing inherited executions,

     2. append happens at plugin level first, then goal level, independently from phases.