|  | @@ -329,7 +329,7 @@ static grpc_error *hc_mutate_op(grpc_exec_ctx *exec_ctx,
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				|  |  |          size_t path_length = strlen(t) + 1;
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				|  |  |          *(t + path_length) = '\0';
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				|  |  |          path_with_query_slice =
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				|  |  | -            grpc_slice_sub_no_ref(path_with_query_slice, 0, path_length);
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				|  |  | +            grpc_slice_sub(path_with_query_slice, 0, path_length);
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				|  |  |  
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				|  |  |          /* substitute previous path with the new path+query */
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				|  |  |          grpc_mdelem mdelem_path_and_query = grpc_mdelem_from_slices(
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