How do I replace $response->headers['Content-Type'] as string on Joomla 4 or 6?

Joomla 4 HTTP responses follow PSR-7: a header name maps to a list of values, not a string. Use Read header values as an array. Use getHeader() and take [0]. Do not strcmp the whole headers array.

Why does JHttp response headers are arrays break after migrating from Joomla 3?

Joomla 4 HTTP responses follow PSR-7: a header name maps to a list of values, not a string. People notice: content-type check fails, JHttp headers.

JHTTP-HEADERS-001

$response->headers['Content-Type'] as string

JHttp response headers are arrays

Joomla 4 HTTP responses follow PSR-7: a header name maps to a list of values, not a string.

$response->headers['Content-Type'] as string → Read header values as an array

Dies at Joomla 3 → 4J3: Works nativelyJ4: Changed behaviourJ6: Changed behaviourBC plugin: not applicablePatch possible — review itJoomla API

Symptoms people search

content-type check fails · JHttp headers

Replace this code

Swap $response->headers['Content-Type'] as string for Read header values as an array.

Joomla 3

Remove or stop calling this

$type = $response->headers['Content-Type'];

Joomla 4 / 6

Use this instead

$type = $response->getHeader('Content-Type')[0] ?? '';

How to fix it

1Use getHeader() and take [0].
2Do not strcmp the whole headers array.

Also known as

JHttp · getHeader

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$response->headers['Content-Type'] as string

Symptoms people search

Replace this code

How to fix it

Also known as

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