Modify Header Value (HTTP Headers)

How to install an extension Open in Chrome Web Store

CRX ID

cbdibdfhahmknbkkojljfncpnhmacdek

Status

Extension status: Featured

Description from extension meta

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

Image from store

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 on 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: to report bugs, please visit addon's homepage (https://mybrowseraddon.com/modify-header-value.html) and fill out the bug report form.

Latest reviews

Daniele B. (ダニエル) 2025-06-26: Doesn't work for POST request, but it says for all requests. Waste of time
Absoluno 2024-08-25: Thanks you for this plugin: I added a custom authorization header in my browser to login without going to the login page to enter email and password
Jethro Vanbrook 2024-05-19: awesome plugin! thanks a lot!
Alexandre Plennevaux 2024-03-26: Very useful extension. Note: I need to change the Host: header to test a cloudfront setup before going live. That did not work in chrome, but it works with this same extension on Firefox. I suspect Chrome changed a setting that prohibits messing with the Host header ?
Yannik Schmidt 2024-02-18: Used this for debugging OAuth X-Forwarded headers on local setups and works great, very helpful, thanks!
Sun Burning 2023-12-19: Can double check again after chrome update? Seems to be broken with me.
Arnie97 2023-09-13: the URL filter works well, and the UI is easy to understand
Arnie97 2023-09-13: the URL filter works well, and the UI is easy to understand
w4tchdoge 2023-05-08: Perfectly acceptable application for my use case, works even faster than Requestly from what I've noticed
w4tchdoge 2023-05-08: Perfectly acceptable application for my use case, works even faster than Requestly from what I've noticed
Marcos Roehe 2022-12-07: Worked for me!
Marcos Roehe 2022-12-07: Worked for me!
James Moberg 2022-11-16: I was comparing this with Requestly and liked that it was free, but it doesn't seem to be completely compatible with HTTP/2 protocol. No JS/CSS resources would load from an IIS website I was working on and I kept seeing a "net::ERR_HTTP2_PROTOCOL_ERROR" logged. I disabled this extension and the issue was immediately resolved. I can't use this if it's going to randomly cause errors by preventing Chrome from consistently loading resources.
James Moberg 2022-11-16: I was comparing this with Requestly and liked that it was free, but it doesn't seem to be completely compatible with HTTP/2 protocol. No JS/CSS resources would load from an IIS website I was working on and I kept seeing a "net::ERR_HTTP2_PROTOCOL_ERROR" logged. I disabled this extension and the issue was immediately resolved. I can't use this if it's going to randomly cause errors by preventing Chrome from consistently loading resources.
Gernot Goetz 2022-09-08: Seems to work only with GET requests. I lost several hours searching a bug, before I found out, that the header of POST requests are not modified by this plugin.
Gernot Goetz 2022-09-08: Seems to work only with GET requests. I lost several hours searching a bug, before I found out, that the header of POST requests are not modified by this plugin.
Sebastien Hideux 2022-08-05: Fonctionne bien sur Firefox, mais ne marche pas sur Brave.
Bruno Magalhães 2022-06-08: No backup option...
Bruno Magalhães 2022-06-08: No backup option...
Михаил Рожко 2022-05-23: Everything worked fine, but now it stopped working correctly, sets the title only for the html page, other resources are now unchanged, which is extremely bad :c
Михаил Рожко 2022-05-23: Everything worked fine, but now it stopped working correctly, sets the title only for the html page, other resources are now unchanged, which is extremely bad :c
Wout Rikkerink 2022-04-07: It stopped working after the latest update
Wout Rikkerink 2022-04-07: It stopped working after the latest update
Massimo Romano 2022-01-11: Useful specific domain selection
Massimo Romano 2022-01-11: Useful specific domain selection
Sekaijin世界人 2021-11-11: Ne fonctionne simplement pas totalement incapable de modifier un header de réponse
Chaitanya Thengdi 2021-05-05: 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.
Chaitanya Thengdi 2021-05-05: 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.
90 دقيقة 2021-02-15: Not a very friendly UI yeah but it really does work, nice job!
90 دقيقة 2021-02-15: Not a very friendly UI yeah but it really does work, nice job!
ImGet 2021-02-02: I just love it.
ImGet 2021-02-02: I just love it.
M C 2020-11-29: 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.
M C 2020-11-29: 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.
Michael Geraghty 2020-10-24: OMG THANK YOU THIS WORKS AMAZING. ITS SO EASY TO USE. ONCE YOU HAVE EVERYTHING SETUP ITS LITERALLY ONE CLICK!! :) 10/10
Michael Geraghty 2020-10-24: OMG THANK YOU THIS WORKS AMAZING. ITS SO EASY TO USE. ONCE YOU HAVE EVERYTHING SETUP ITS LITERALLY ONE CLICK!! :) 10/10
Mihai Mocanu 2020-03-18: Not working properly for existing headers
Mihai Mocanu 2020-03-18: Not working properly for existing headers
xueshi 2020-02-17: Worked well for me, and it allows me to control configuration by URL, it's very useful to me. Thanks!
xueshi 2020-02-17: Worked well for me, and it allows me to control configuration by URL, it's very useful to me. Thanks!
sam mabaquiao 2019-08-30: totally helps me. it didn't work when I upgraded my chrome to version 76, until reverted back to chrome 75
sam mabaquiao 2019-08-30: totally helps me. it didn't work when I upgraded my chrome to version 76, until reverted back to chrome 75
Stine Petersen 2019-07-19: Worked well for what i wanted to use it for, simple and useful
Stine Petersen 2019-07-19: Worked well for what i wanted to use it for, simple and useful
Anonymous 2019-02-28: Doesn't modify existing http header item.
Anonymous 2019-02-28: Doesn't modify existing http header item.
Leo Keuken 2018-05-31: lacks proper guidance on how to use it.
Leo Keuken 2018-05-31: lacks proper guidance on how to use it.
Alberto 2018-04-26: It works. Perfect tool for testing SSO configurations. The interface is a little weird but it works great. Time saver.
Alberto 2018-04-26: It works. Perfect tool for testing SSO configurations. The interface is a little weird but it works great. Time saver.

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