[#OSSL_HTTP_bio_cb_t]
= OSSL_HTTP_bio_cb_t
:mrdocs:

Optional callback that updates or replaces the HTTP connection BIO around connect/TLS.

== Synopsis

Declared in `<openssl/http.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:BIO.adoc[BIO]*(* OSSL_HTTP_bio_cb_t)(xref:BIO.adoc[BIO]*, void*, int, int);
----

== Return Value

BIO to use for subsequent HTTP I/O, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| Current connection BIO (may be NULL before connect).
| *arg*
| User pointer supplied to OSSL_HTTP_open().
| *connect*
| Non‐zero when establishing the connection; zero when disconnecting.
| *detail*
| Non‐zero to request detailed error reporting from the callback.
|===


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