code: public UploadMetadata withSignedHeaders(java.util.Map<String, String> signedHeaders) {
          setSignedHeaders(signedHeaders);
          return this;
      }
docs: <p>
  The signed headers.
  </p>
  
  @param signedHeaders
  The signed headers.
  @return Returns a reference to this object so that method calls can be chained together.