Hello, I think it would make sense to implement a function in textops similar to remove_hf(x) but remove_all_hf(x) in order to be sure a certain header field is not present any more. The specific scenario is setting up a RFC3323/3325-compilant platform, where it is imperative that untrusted nodes are not able to inject any "P-Asserted-Identity" header field into trusted nodes. I'm not sure remove_hf() does the job in this case. With best regards, Martin