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AphrontPHPHTTPSink.php
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			<?php

			/**
			* Concrete HTTP sink which uses "echo" and "header()" to emit data.
			*/
			final class AphrontPHPHTTPSink extends AphrontHTTPSink {

			protected function emitHTTPStatus($code, $message = '') {
			if ($code != 200) {
			$header = "HTTP/1.0 {$code}";
			if (phutil_nonempty_string($message)) {
			$header .= " {$message}";
			}
			header($header);
			}
			}

			protected function emitHeader($name, $value) {
			header("{$name}: {$value}", $replace = false);
			}

			protected function emitData($data) {
			echo $data;

			// NOTE: We don't call flush() here because it breaks HTTPS under Apache.
			// See T7620 for discussion. Even without an explicit flush, PHP appears to
			// have reasonable behavior here: the echo will block if internal buffers
			// are full, and data will be sent to the client once enough of it has
			// been buffered.
			}

			protected function isWritable() {
			return !connection_aborted();
			}

			}