public ContentTooLargeExceptionBuilder contentLength(long contentLength) {
        checkArgument(contentLength >= 0, "contentLength: %s (expected: >= 0)", contentLength);
        this.contentLength = contentLength;
        return this;
    }
Sets the actual content length in bytes, as specified in the {@code content-length} header.
core/src/main/java/com/linecorp/armeria/common/ContentTooLargeExceptionBuilder.java