extension ExtPose

Modify Header Value (HTTP Headers)

CRX id


Description from extension meta

Add, modify or remove a header for any request on desired domains.

Image from store Modify Header Value (HTTP Headers)
Description from store Modify Header Value (HTTP Headers) is an extension that can add, modify or remove an HTTP-request-header for all requests on a desired website or URL. This Addon is very useful if you are an App developer, website designer, or if you want to test a particular header for a request on a website. Key features: 1. Easily add, modify or remove a header for any request on desired domains. 2. For a complete list of HTTP headers, please take a look at the list of all HTTP Header Fields in the Wikipedia page (https://en.wikipedia.org/wiki/List_of_HTTP_header_fields). 3. Clicking on the Toolbar icon opens a UI to quickly switch the Addon ON or OFF, or open the options page. 4. Each header item has several options to adjust (see add-on's Options page for details) 5. You can add several header items and active or inactive them separately. 6. An example in the options page shows a tutorial on "How to add a custom header". Note: in order to submit bugs, please visit add-on's homepage (https://mybrowseraddon.com/modify-header-value.html) and fill the bug report form.

Latest reviews

  • (2021-05-05) Chaitanya Thengdi: Doesn't work sometimes. At random intervals, this extension stops doing the one thing it's designed to do: inject headers in browser requests. There is really no consistency to this, I had to simply disable the extension and use another. Since this one has URL filtering(and the other one doesn't) I'm still leaving this as installed. Otherwise, there's no real reason for me to keep this. Consistency is vital.
  • (2021-02-15) 90 دقيقة: Not a very friendly UI yeah but it really does work, nice job!
  • (2021-02-02) ImGet: I just love it.
  • (2020-11-29) Matthew Connor: This extension does appear to work as advertised but there's a lot of room for improvement in the GUI and instructions. For example, the instructions explain what each column does by assigning them a number and saying, "Column 1 does this, Column 2 does that," etc, but the columns in the actual GUI aren't numbered. They are NAMED. So when you read "Column 9 does so and so," you can't just look down and find "Column 9" because there is no such label. You have to sit there and count the columns up to 9 to see which one they are referencing. Another problem (which could be user error) is that the 'Sub' checkbox doesn't appear to work properly. The instructions state that if 'Sub' is NOT checked, "the header will be applied to the exact URL(s) matching the given URL." However, I have yet to find a configuration in which checking the 'Sub' box activates the rule. The rules only work when 'Sub' is unchecked. According to the instructions, if I leave it unchecked, the changes should only apply to the EXACT URL entered. To reproduce the problem, create a rule with the following values: URL: https://www.whatismybrowser.com/detect/what-http-headers-is-my-browser-sending Domain: <checked or unchecked> (value doesn't appear to matter) Sub: <checked> Header Name: User-Agent Add: <checked> Modify: <unchecked> Remove: <unchecked> Header Value: Test 123 State: ACTIVE Now browse to the URL listed in the rule and view the displayed "USER-AGENT" header value. Note that the User-Agent does NOT display "Test 123." Now go back to the rule and uncheck the "Sub" box and then reload the test page. Note that the User-Agent now displays "Test 123." Since I specified the EXACT URL and then visited that exact URL, I would expect the User-Agent to display "Test 123" both when 'Sub' is unchecked and when it is checked. This means I have yet to be able to create a rule that applies only to a specific URL and not the entire site.
  • (2020-03-18) Mihai Mocanu: Not working properly for existing headers
  • (2020-02-17) Joey Blue: Worked well for me, and it allows me to control configuration by URL, it's very useful to me. Thanks!
  • (2019-08-30) sam mabaquiao: totally helps me. it didn't work when I upgraded my chrome to version 76, until reverted back to chrome 75
  • (2019-07-19) Stine Petersen: Worked well for what i wanted to use it for, simple and useful
  • (2019-02-28) Doesn't modify existing http header item.
  • (2018-05-31) Leo Keuken: lacks proper guidance on how to use it.
  • (2018-04-26) Alberto: It works. Perfect tool for testing SSO configurations. The interface is a little weird but it works great. Time saver.
  • (2018-04-04) Jonathan Baggaley: Just couldn't get it to work for me as I wanted & the ux not great :-(
  • (2017-12-16) Paul Stanley: Confusing ugly UI, but it does work. I needed a way to add an Authorization header for a specific URL. For that purpose, this works perfectly.
  • (2017-11-16) Michael Enke: Modify "Accept" header doesn't work. Settings: "*" "Accept" "application/json,text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8" It also doesn't print to console. Chrome 62.0
  • (2017-10-19) Does not work. "Modify Headers" is better. I like the idea of modifying headers by URL but this just doesn't work.
  • (2017-09-15) Vojtěch Semecký: Předpotopní
  • (2017-08-25) Roger Enriquez: Reliable and straightforward. Really needs edit abilities.
  • (2017-04-14) Brian Prince: URL filter - nice! 5 stars just for that.
  • (2017-02-01) JM Prasad: Works perfectly
  • (2017-01-24) xiaojie liu: very cool
  • (2016-08-26) Manivannan R: This is the only Modify header addon i found which has URL filters options. UI is not Attractive but it serves the purpose & clear guidlines

Latest issues

  • (2016-08-26, v:0.1.1) Manivannan R: URl Regex
    I wan to apply headers to only on my sub domains. can i set url vale as https://*.mydomainname.com/* ??


40,411 history
3.4 (28 votes)
Last update / version
2020-10-23 / 0.1.7
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