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AWS Lambda: Special case API Gateway responses to recompress data, to work around base64/binary content issues.

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This commit is contained in:
Brandon Liu
2022-11-21 17:04:06 +08:00
parent 1d74564ab4
commit 533df1ba1c
1 changed files with 20 additions and 8 deletions
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28
serverless/aws/src/index.ts
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@@ -201,14 +201,26 @@ export const handler = async (
const tile_result = await p.getZxy(tile[0], tile[1], tile[2]);
if (tile_result) {
// returns uncompressed response
// TODO: may need to special case API gateway to return compressed response with gzip content-encoding header
return apiResp(
200,
Buffer.from(tile_result.data).toString("base64"),
true,
headers
);
if (is_api_gateway) {
// this is wasted work, but we need to force API Gateway to interpret the Lambda response as binary
// without depending on clients sending matching Accept: headers in the request.
const recompressed_data = zlib.gzipSync(tile_result.data);
headers["Content-Encoding"] = "gzip";
return apiResp(
200,
Buffer.from(recompressed_data).toString("base64"),
true,
headers
);
} else {
// returns uncompressed response
return apiResp(
200,
Buffer.from(tile_result.data).toString("base64"),
true,
headers
);
}
} else {
return apiResp(204, "", false, headers);
}