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--- contrib/libs/grpc/src/core/lib/compression/message_compress.cc (a31456d79c5352c94e2eced9c1df3b5c9f3353b8)
+++ contrib/libs/grpc/src/core/lib/compression/message_compress.cc (index)
@@ -103,7 +103,7 @@ static int zlib_compress(grpc_slice_buffer* input, grpc_slice_buffer* output,
memset(&zs, 0, sizeof(zs));
zs.zalloc = zalloc_gpr;
zs.zfree = zfree_gpr;
- r = deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 | (gzip ? 16 : 0),
+ r = deflateInit2(&zs, getenv("GRPC_ZLEVEL") ? atoi(getenv("GRPC_ZLEVEL")) : Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 | (gzip ? 16 : 0),
8, Z_DEFAULT_STRATEGY);
GPR_ASSERT(r == Z_OK);
r = zlib_body(&zs, input, output, deflate) && output->length < input->length;
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