I figured out what the problem was. In the end, I added &noheader=true to my form action. This allowed me to submit my own headers without calling the WP admin headers.
Related Posts:
- Proper way to pass credentials in a custom login form to avoid “headers already sent”
- WordPress Plugin Development – Headers Already Sent Message
- No Error Log File, no debug info
- How should one implement add_settings_error on custom menu pages?
- Prevent notice and warnings in error_reporting?
- Clarity needed on usage of multiple 403 forbidden header() functions at the beginning of the plugin files
- How to log plugin errors to plugin error_log file
- Catch own Exceptions
- Headers already sent error with CSV export plugin
- Get file headers in custom file
- Throw 403 in a plugin [duplicate]
- Using ob_start() in plugin
- Adding custom code into header.php using a plugin
- why don’t I get error messages in admin when developing?
- WP_Error handles errors, but how can I show success with a message?
- How can I change HTTP headers only to posts of a specific category from a plugin
- Settings API – Undefined Index when unchecking checkbox
- The plugin generated 80 characters of unexpected output!
- Error : “Updating failed: The response is not a valid JSON response” with custom shortcode
- Cannot modify header information – headers already sent by pluggable.php
- How can I display an error message after post has been saved?
- Execution limit and Memory limit errors even i changed to 1024M and 600(cache.php,load.php)?
- Header Button Chance Polylang Elementor
- An echo line in a transition_post_status action leads to “cannot modify header information – headers already sent by”
- Two functions utilizing registration_errors filter
- How can I gracefully escape an error condition?
- Serve text/html from wp-json API via WPEngine, headers not being set properly
- How to give a download link to a .csv file from the custom plugin?
- WordPress debug messages not displaying
- Adding custom stylesheet into header.php using a plugin
- Custom Post Type Object – Undefined Variables
- Reporting errors in a shortcode plugin
- What might be the reason of Couldn’t fetch mysqli_result on another domain?
- Plugin can’t be activated [closed]
- How do I debug an error that a plugin is causing?
- “Rendering of admin template [path to template] failed”
- Is there any way to pass messages from a script to a redirect target in a hidden fashion?
- Why does website stretch and white space on load? [duplicate]
- Downloading File via headers doesnt work
- Import images remotly run through timeout error
- Error code when migrate
- WordPress Favicon not Working For Images/Videos/PDFs
- WPGut – Updating failed and shortcode?
- GET request return value as error instead of success
- WP_Fatal_Error_Handler OR WP_Error OR try/catch
- Custom Plugin activation error in Multisite
- Two same AJAX calls – one is working, other doesn’t
- Some data has already been output, can’t send PDF file – fpdf issue in WordPress
- Warning: Illegal string offset – on homepage
- Headers already sent on custom plugin (Export function)
- How to force download a plugin generated file?
- Not able to Update database while creating a custom module
- Plugin error on activation – breaks page encoding and prints the code of plugin php files
- Getting error of unexpected output during activation
- Trying to build a plugin – Cannot modify header information
- What’s the best method for emptying an option created with the Settings API?
- template_include (overriding default plugin templates via current theme)
- What is nonce and how to use it with Ajax in WordPress? [duplicate]
- Update exisiting site to 3.5 release candidate
- Why does do_action pass a blank string as the first parameter if no $arg is set?
- add_filter and remove_filter added before and after wp_query
- How can I hook into existing WordPress Bulk actions?
- creating elements/innerblocks via rangecontrol
- How to check if current static page is frontpage from admin plugin
- What method to use to call a REST API?
- Why my database table not created on activation?
- Resizing Images for a Gallery-Plugin?
- Which themes do you use to test compatibilities with your plugin [closed]
- How to debug a unit test for a WordPress plugin, which uses wordpress-test?
- Adding functions to hooks from within a class
- What filters to call to modify the output of the entire page?
- Tried in different ways but sidebar not working?
- How to Create a Simple Related Posts Plugin
- Help With Rewrite_Rules For a Custom Plug-In
- Theme Install using a Custom Repository
- How to add plugin version update option in plugin row action?
- wp_filesystem put_contents issue with owner/group
- error ‘The package could not be installed. No valid plugins were found.’
- Gutenberg table block with Bootstrap .table class
- Translate MCE button text/tooltip in custom plugin
- Can’t change the style of a submit input type? [closed]
- WordPress error: Options page Setting_ not found in the allowed options list
- How can I create a custom plugin that allows anonymous users to signup without registering?
- WP: Search and replace in DB programmatically
- How to silent ‘Attempting a database schema change is discouraged.’?
- Get images / media attached to a page by page ID
- How to create two custom post types when plugin is activated?
- Plugin admin page stylesheet doesn’t work
- Creating posts with links from a txt file
- WordPress can’t use ZipArchive
- escape html in jQuery for WordPress
- Progress bar in plugin within admin
- Redirection from a specific page for users logged in but not with membership
- Can’t get wpColorPicker to work in a widget
- WordPress Plugin Update Process
- Registration form Plugin… Email confirmation
- Can’t add images in wordpress to my page – button isn’t clickable
- Gutenberg and custom blocks messed up pagespeed score. What did I wrong?
- Gutenberg text field validation
- Is it smart to require_once wp-admin/includes/plugin.php when you need only one function from it