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Update PrometheusScrapeHandler compression handling #1493

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Merged
zeitlinger merged 1 commit into from
Aug 7, 2025
Merged

Update PrometheusScrapeHandler compression handling #1493

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10 changes: 5 additions & 5 deletions ...r-common/src/main/java/io/prometheus/metrics/exporter/common/PrometheusScrapeHandler.java
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Original file line number Diff line number Diff line change
Expand Up @@ -57,22 +57,22 @@ public void handleRequest(PrometheusHttpExchange exchange) throws IOException {
if (writeDebugResponse(snapshots, exchange)) {
return;
}
ByteArrayOutputStream responseBuffer =
new ByteArrayOutputStream(lastResponseSize.get() + 1024);
String acceptHeader = request.getHeader("Accept");
ExpositionFormatWriter writer = expositionFormats.findWriter(acceptHeader);
writer.write(responseBuffer, snapshots);
lastResponseSize.set(responseBuffer.size());
PrometheusHttpResponse response = exchange.getResponse();
response.setHeader("Content-Type", writer.getContentType());

if (shouldUseCompression(request)) {
response.setHeader("Content-Encoding", "gzip");
try (GZIPOutputStream gzipOutputStream =
new GZIPOutputStream(response.sendHeadersAndGetBody(200, 0))) {
responseBuffer.writeTo(gzipOutputStream);
writer.write(gzipOutputStream, snapshots);
}
} else {
ByteArrayOutputStream responseBuffer =
new ByteArrayOutputStream(lastResponseSize.get() + 1024);
writer.write(responseBuffer, snapshots);
lastResponseSize.set(responseBuffer.size());
int contentLength = responseBuffer.size();
if (contentLength > 0) {
response.setHeader("Content-Length", String.valueOf(contentLength));
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