Add-on to Manipulate Header Data Sent to Server

[pale guru]

I remember reading about some Add-on that can manipulate Header Data before they are sent to the Server (I think it was changing User Agent). I went through the Add-ons list, but couldn't find any that would suite this.

Maybe someone can help. I like to alter header data according to a static list or regex. Thanks.

[Michaell]

Modify Headers in Classic Addons Archive is the old standard one. But it's really old. You might be better off with JustOff's Modify Http Response:
https://github.com/JustOff/modify-http- ... /tag/1.3.8

[Goodydino]

Modify Headers in Classic Addons Archive is the old standard one. But it's really old. You might be better off with JustOff's Modify Http Response:
https://github.com/JustOff/modify-http- ... /tag/1.3.8

There is practically no description of that at github. The name sounds as if it would modify the server's response, not the browser's request.

[moonbat]

There is practically no description of that at github.

You'll see it often mentioned here, adoxa creates rules for it for broken websites. It works great.

[BenFenner]

For one-off usage, the developer console can do this (no addon needed). It's a bit clunky, but comes in handy when I need it.

[Michaell]

Regarding using Developer Console to modify headers, I think a lot of folks could benefit from instruction on how that is done. A tutorial topic would be good..

[billmcct]

More info for the addon:
https://github.com/JustOff/modify-http-response

It's a fork of the original.

[back2themoon]

There's also the newer fork of the fork (that's how I remember it anyway), "Intercept & Modify HTTP Response" by tellu_white (v.4.3 is the latest, probably - cannot be sure), but since the author refused to upload it to the Add-Ons Site it can only be found somewhere between the forum abyss and dodgy Mediafire links.

And understandably so, no one will bother looking for something that is not visible. Yet another reason for tellu_white to hopefully reconsider.

[Moonchild]

The thing is, OP asked to modify the request headers, not the response headers.
I'm not entirely sure what they hope to achieve though, and no details were given.

[Goodydino]

The description says that only one filter is used per host. What if there is more than one field in the response header that you want to modify? Which one would be chosen - the first one in the header?

[adoxa]

I remember reading about some Add-on that can manipulate Header Data before they are sent to the Server. ... I like to alter header data according to a static list or regex.

You may like to look at moz-rewrite.

[pale guru]

Wonderful. Thanks. moz-rewrite is just what I'm looking for.

One usage scenario is to manipulate fingerprinting data to contain just blank response or rubbisch data.

More and more online shops are hosted in a cloud environment where clients and customers are constantly observed and 'fingerrpinted' and judged to be be 'good clients' or 'bad bots'. From my side, if they ignore Sec-GPC completely, I consider them 'bad' myself.

[Moonchild]

if they ignore Sec-GPC completely, I consider them 'bad' myself.

You can check if a shop intends to follow the Global Privacy Control mandate/legal framework by checking .well-known/gpc.json on the server. If present and set to "true" in the json data you have a conclusive signal they will follow the standard and will not sell or share your data if you send them the Sec-GPC request from the browser. Example on our own website: https://www.palemoon.org/.well-known/gpc.json
Keep in mind that this does not mean they won't be gathering data or fingerprinting/profiling you internally (that is subject to their privacy policy) but Sec-GPC prohibits them from sharing that data with or selling that data to others. That is the main difference between DNT and Sec-GPC. The former (prohibiting any internal data gathering) is unenforceable and breaking many commercial models/technical implementations.