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.\" ========================================================================
.\"
.IX Title "OSSL_HTTP_REQ_CTX 3ossl"
.TH OSSL_HTTP_REQ_CTX 3ossl "2024-06-04" "3.3.1" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
OSSL_HTTP_REQ_CTX,
OSSL_HTTP_REQ_CTX_new,
OSSL_HTTP_REQ_CTX_free,
OSSL_HTTP_REQ_CTX_set_request_line,
OSSL_HTTP_REQ_CTX_add1_header,
OSSL_HTTP_REQ_CTX_set_expected,
OSSL_HTTP_REQ_CTX_set1_req,
OSSL_HTTP_REQ_CTX_nbio,
OSSL_HTTP_REQ_CTX_nbio_d2i,
OSSL_HTTP_REQ_CTX_exchange,
OSSL_HTTP_REQ_CTX_get0_mem_bio,
OSSL_HTTP_REQ_CTX_get_resp_len,
OSSL_HTTP_REQ_CTX_set_max_response_length,
OSSL_HTTP_is_alive,
OSSL_HTTP_REQ_CTX_set_max_response_hdr_lines
\&\- HTTP client low\-level functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/http.h>
\&
\& typedef struct ossl_http_req_ctx_st OSSL_HTTP_REQ_CTX;
\&
\& OSSL_HTTP_REQ_CTX *OSSL_HTTP_REQ_CTX_new(BIO *wbio, BIO *rbio, int buf_size);
\& void OSSL_HTTP_REQ_CTX_free(OSSL_HTTP_REQ_CTX *rctx);
\&
\& int OSSL_HTTP_REQ_CTX_set_request_line(OSSL_HTTP_REQ_CTX *rctx, int method_POST,
\&                                        const char *server, const char *port,
\&                                        const char *path);
\& int OSSL_HTTP_REQ_CTX_add1_header(OSSL_HTTP_REQ_CTX *rctx,
\&                                   const char *name, const char *value);
\&
\& int OSSL_HTTP_REQ_CTX_set_expected(OSSL_HTTP_REQ_CTX *rctx,
\&                                    const char *content_type, int asn1,
\&                                    int timeout, int keep_alive);
\& int OSSL_HTTP_REQ_CTX_set1_req(OSSL_HTTP_REQ_CTX *rctx, const char *content_type,
\&                                const ASN1_ITEM *it, const ASN1_VALUE *req);
\& int OSSL_HTTP_REQ_CTX_nbio(OSSL_HTTP_REQ_CTX *rctx);
\& int OSSL_HTTP_REQ_CTX_nbio_d2i(OSSL_HTTP_REQ_CTX *rctx,
\&                                ASN1_VALUE **pval, const ASN1_ITEM *it);
\& BIO *OSSL_HTTP_REQ_CTX_exchange(OSSL_HTTP_REQ_CTX *rctx);
\&
\& BIO *OSSL_HTTP_REQ_CTX_get0_mem_bio(const OSSL_HTTP_REQ_CTX *rctx);
\& size_t OSSL_HTTP_REQ_CTX_get_resp_len(const OSSL_HTTP_REQ_CTX *rctx);
\& void OSSL_HTTP_REQ_CTX_set_max_response_length(OSSL_HTTP_REQ_CTX *rctx,
\&                                                unsigned long len);
\&
\& int OSSL_HTTP_is_alive(const OSSL_HTTP_REQ_CTX *rctx);
\&
\& void OSSL_HTTP_REQ_CTX_set_max_response_hdr_lines(OSSL_HTTP_REQ_CTX *rctx,
\&                                                   size_t count);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fB\s-1OSSL_HTTP_REQ_CTX\s0\fR is a context structure for an \s-1HTTP\s0 request and response,
used to collect all the necessary data to perform that request.
.PP
This file documents low-level \s-1HTTP\s0 functions rarely used directly.  High-level
\&\s-1HTTP\s0 client functions like \fIOSSL_HTTP_get\fR\|(3) and \fIOSSL_HTTP_transfer\fR\|(3)
should be preferred.
.PP
\&\fIOSSL_HTTP_REQ_CTX_new()\fR allocates a new \s-1HTTP\s0 request context structure,
which gets populated with the \fB\s-1BIO\s0\fR to write/send the request to (\fIwbio\fR),
the \fB\s-1BIO\s0\fR to read/receive the response from (\fIrbio\fR, which may be equal to
\&\fIwbio\fR), and the maximum expected response header line length \fIbuf_size\fR.
A value <= 0 indicates that
the \fB\s-1OSSL_HTTP_DEFAULT_MAX_LINE_LEN\s0\fR of 4KiB should be used.
\&\fIbuf_size\fR is also used as the number of content bytes that are read at a time.
The allocated context structure includes an internal memory \fB\s-1BIO\s0\fR,
which collects the \s-1HTTP\s0 request header lines.
.PP
\&\fIOSSL_HTTP_REQ_CTX_free()\fR frees up the \s-1HTTP\s0 request context \fIrctx\fR.
The \fIrbio\fR is not free'd, \fIwbio\fR will be free'd if \fIfree_wbio\fR is set.
.PP
\&\fIOSSL_HTTP_REQ_CTX_set_request_line()\fR adds the 1st \s-1HTTP\s0 request line to \fIrctx\fR.
The \s-1HTTP\s0 method is determined by \fImethod_POST\fR,
which should be 1 to indicate \f(CW\*(C`POST\*(C'\fR or 0 to indicate \f(CW\*(C`GET\*(C'\fR.
\&\fIserver\fR and \fIport\fR may be set to give the server and the optional port that
an \s-1HTTP\s0 proxy shall forward the request to, otherwise they must be left \s-1NULL.
\&\s0\fIpath\fR provides the \s-1HTTP\s0 request path; if left \s-1NULL, \s0\f(CW\*(C`/\*(C'\fR is used.
For backward compatibility, \fIpath\fR may begin with \f(CW\*(C`http://\*(C'\fR and thus convey
an absoluteURI. In this case it indicates \s-1HTTP\s0 proxy use and provides also the
server (and optionally the port) that the proxy shall forward the request to.
In this case the \fIserver\fR and \fIport\fR arguments must be \s-1NULL.\s0
.PP
\&\fIOSSL_HTTP_REQ_CTX_add1_header()\fR adds header \fIname\fR with value \fIvalue\fR to the
context \fIrctx\fR. It can be called more than once to add multiple header lines.
For example, to add a \f(CW\*(C`Host\*(C'\fR header for \f(CW\*(C`example.com\*(C'\fR you would call:
.PP
.Vb 1
\& OSSL_HTTP_REQ_CTX_add1_header(ctx, "Host", "example.com");
.Ve
.PP
\&\fIOSSL_HTTP_REQ_CTX_set_expected()\fR optionally sets in \fIrctx\fR some expectations
of the \s-1HTTP\s0 client on the response.
Due to the structure of an \s-1HTTP\s0 request, if the \fIkeep_alive\fR argument is
nonzero the function must be used before calling \fIOSSL_HTTP_REQ_CTX_set1_req()\fR.
.PP
If the \fIcontent_type\fR argument is not \s-1NULL,\s0
the client will check that the specified content-type string
is included in the \s-1HTTP\s0 header of the response and return an error if not.
In the content-type header line the specified string should be present either
as a whole, or in case the specified string does not include a \f(CW\*(C`;\*(C'\fR character,
it is sufficient that the specified string appears as a prefix
in the header line, followed by a \f(CW\*(C`;\*(C'\fR character and any further text.
For instance, if the \fIcontent_type\fR argument specifies \f(CW\*(C`text/html\*(C'\fR,
this is matched by \f(CW\*(C`text/html\*(C'\fR, \f(CW\*(C`text/html; charset=UTF\-8\*(C'\fR, etc.
.PP
If the \fIasn1\fR parameter is nonzero a structure in \s-1ASN.1\s0 encoding will be
expected as the response content and input streaming is disabled.  This means
that an \s-1ASN.1\s0 sequence header is required, its length field is checked, and
\&\fIOSSL_HTTP_REQ_CTX_get0_mem_bio()\fR should be used to get the buffered response.
Otherwise (by default) any input format is allowed without length checks.
In this case the \s-1BIO\s0 given as \fIrbio\fR argument to \fIOSSL_HTTP_REQ_CTX_new()\fR should
be used directly to read the response contents, which may support streaming.
If the \fItimeout\fR parameter is > 0 this indicates the maximum number of seconds
the subsequent \s-1HTTP\s0 transfer (sending the request and receiving a response)
is allowed to take.
\&\fItimeout\fR == 0 enables waiting indefinitely, i.e., no timeout can occur.
This is the default.
\&\fItimeout\fR < 0 takes over any value set via the \fIoverall_timeout\fR argument of
\&\fIOSSL_HTTP_open\fR\|(3) with the default being 0, which means no timeout.
If the \fIkeep_alive\fR parameter is 0, which is the default, the connection is not
kept open after receiving a response. This is the default behavior for \s-1HTTP 1.0.\s0
If the value is 1 or 2 then a persistent connection is requested.
If the value is 2 then a persistent connection is required,
i.e., an error occurs in case the server does not grant it.
.PP
\&\fIOSSL_HTTP_REQ_CTX_set1_req()\fR finalizes the \s-1HTTP\s0 request context.
It is needed if the \fImethod_POST\fR parameter in the
\&\fIOSSL_HTTP_REQ_CTX_set_request_line()\fR call was 1
and an \s-1ASN\s0.1\-encoded request should be sent.
It must also be used when requesting \*(L"keep-alive\*(R",
even if a \s-1GET\s0 request is going to be sent, in which case \fIreq\fR must be \s-1NULL.\s0
Unless \fIreq\fR is \s-1NULL,\s0 the function adds the \s-1DER\s0 encoding of \fIreq\fR using
the \s-1ASN.1\s0 template \fIit\fR to do the encoding (which does not support streaming).
The \s-1HTTP\s0 header \f(CW\*(C`Content\-Length\*(C'\fR is filled out with the length of the request.
\&\fIcontent_type\fR must be \s-1NULL\s0 if \fIreq\fR is \s-1NULL.\s0
If \fIcontent_type\fR isn't \s-1NULL,\s0
the \s-1HTTP\s0 header \f(CW\*(C`Content\-Type\*(C'\fR is also added with the given string value.
The header lines are added to the internal memory \fB\s-1BIO\s0\fR for the request header.
.PP
\&\fIOSSL_HTTP_REQ_CTX_nbio()\fR attempts to send the request prepared in \fIrctx\fR
and to gather the response via \s-1HTTP,\s0 using the \fIwbio\fR and \fIrbio\fR
that were given when calling \fIOSSL_HTTP_REQ_CTX_new()\fR.
The function may need to be called again if its result is \-1, which indicates
\&\fIBIO_should_retry\fR\|(3).  In such a case it is advisable to sleep a little in
between, using \fIBIO_wait\fR\|(3) on the read \s-1BIO\s0 to prevent a busy loop.
.PP
\&\fIOSSL_HTTP_REQ_CTX_nbio_d2i()\fR is like \fIOSSL_HTTP_REQ_CTX_nbio()\fR but on success
in addition parses the response, which must be a DER-encoded \s-1ASN.1\s0 structure,
using the \s-1ASN.1\s0 template \fIit\fR and places the result in \fI*pval\fR.
.PP
\&\fIOSSL_HTTP_REQ_CTX_exchange()\fR calls \fIOSSL_HTTP_REQ_CTX_nbio()\fR as often as needed
in order to exchange a request and response or until a timeout is reached.
On success it returns a pointer to the \s-1BIO\s0 that can be used to read the result.
If an \s-1ASN\s0.1\-encoded response was expected, this is the \s-1BIO\s0
returned by \fIOSSL_HTTP_REQ_CTX_get0_mem_bio()\fR when called after the exchange.
This memory \s-1BIO\s0 does not support streaming.
Otherwise the returned \s-1BIO\s0 is the \fIrbio\fR given to \fIOSSL_HTTP_REQ_CTX_new()\fR,
which may support streaming.
When this \s-1BIO\s0 is returned, it has been read past the end of the response header,
such that the actual response body can be read from it.
The returned \s-1BIO\s0 pointer \s-1MUST NOT\s0 be freed by the caller.
.PP
\&\fIOSSL_HTTP_REQ_CTX_get0_mem_bio()\fR returns the internal memory \fB\s-1BIO\s0\fR.
Before the \s-1HTTP\s0 request is sent, this could be used to adapt its header lines.
\&\fIUse with caution!\fR
After receiving a response via \s-1HTTP,\s0 the \s-1BIO\s0 represents the current state of
reading the response header. If the response was expected to be \s-1ASN.1\s0 encoded,
its contents can be read via this \s-1BIO,\s0 which does not support streaming.
The returned \s-1BIO\s0 pointer must not be freed by the caller.
.PP
\&\fIOSSL_HTTP_REQ_CTX_get_resp_len()\fR returns the size of the response contents
in \fIrctx\fR if provided by the server as <Content\-Length> header field, else 0.
.PP
\&\fIOSSL_HTTP_REQ_CTX_set_max_response_length()\fR sets the maximum allowed
response content length for \fIrctx\fR to \fIlen\fR. If not set or \fIlen\fR is 0
then the \fB\s-1OSSL_HTTP_DEFAULT_MAX_RESP_LEN\s0\fR is used, which currently is 100 KiB.
If the \f(CW\*(C`Content\-Length\*(C'\fR header is present and exceeds this value or
the content is an \s-1ASN.1\s0 encoded structure with a length exceeding this value
or both length indications are present but disagree then an error occurs.
.PP
\&\fIOSSL_HTTP_is_alive()\fR can be used to query if the \s-1HTTP\s0 connection
given by \fIrctx\fR is still alive, i.e., has not been closed.
It returns 0 if \fIrctx\fR is \s-1NULL.\s0
.PP
If the client application requested or required a persistent connection
and this was granted by the server, it can keep \fIrctx\fR as long as it wants
to send further requests and \fIOSSL_HTTP_is_alive()\fR returns nonzero,
else it should call \fIOSSL_HTTP_REQ_CTX_free(rctx)\fR or \fIOSSL_HTTP_close\fR\|(3).
In case the client application keeps \fIrctx\fR but the connection then dies
for any reason at the server side, it will notice this obtaining an
I/O error when trying to send the next request via \fIrctx\fR.
.PP
The \fIOSSL_HTTP_REQ_CTX_set_max_response_hdr_lines()\fR function changes the limit
for the number of \s-1HTTP\s0 headers which can be received in a response. The default
value is 256.  If the number of \s-1HTTP\s0 headers in a response exceeds the limit,
then the \s-1HTTP_R_RESPONSE_TOO_MANY_HDRLINES\s0 error is indicated. Setting the
limit to 0 disables the check.
.SH "WARNINGS"
.IX Header "WARNINGS"
The server's response may be unexpected if the hostname that was used to
create the \fIwbio\fR, any \f(CW\*(C`Host\*(C'\fR header, and the host specified in the
request \s-1URL\s0 do not match.
.PP
Many of these functions must be called in a certain order.
.PP
First, the \s-1HTTP\s0 request context must be allocated:
\&\fIOSSL_HTTP_REQ_CTX_new()\fR.
.PP
Then, the \s-1HTTP\s0 request must be prepared with request data:
.IP "1." 4
Calling \fIOSSL_HTTP_REQ_CTX_set_request_line()\fR.
.IP "2." 4
Adding extra header lines with \fIOSSL_HTTP_REQ_CTX_add1_header()\fR.
This is optional and may be done multiple times with different names.
.IP "3." 4
Finalize the request using \fIOSSL_HTTP_REQ_CTX_set1_req()\fR.
This may be omitted if the \s-1GET\s0 method is used and \*(L"keep-alive\*(R" is not requested.
.PP
When the request context is fully prepared, the \s-1HTTP\s0 exchange may be performed
with \fIOSSL_HTTP_REQ_CTX_nbio()\fR or \fIOSSL_HTTP_REQ_CTX_exchange()\fR.
.SH "NOTES"
.IX Header "NOTES"
When built with tracing enabled, \fIOSSL_HTTP_REQ_CTX_nbio()\fR and all functions
using it, such as \fIOSSL_HTTP_REQ_CTX_exchange()\fR and \fIOSSL_HTTP_transfer\fR\|(3),
may be traced using \fB\s-1OSSL_TRACE_CATEGORY_HTTP\s0\fR.
See also \fIOSSL_trace_enabled\fR\|(3) and \*(L"\s-1ENVIRONMENT\*(R"\s0 in \fIopenssl\fR\|(1).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIOSSL_HTTP_REQ_CTX_new()\fR returns a pointer to a \fB\s-1OSSL_HTTP_REQ_CTX\s0\fR, or \s-1NULL\s0
on error.
.PP
\&\fIOSSL_HTTP_REQ_CTX_free()\fR and \fIOSSL_HTTP_REQ_CTX_set_max_response_length()\fR
do not return values.
.PP
\&\fIOSSL_HTTP_REQ_CTX_set_request_line()\fR, \fIOSSL_HTTP_REQ_CTX_add1_header()\fR,
\&\fIOSSL_HTTP_REQ_CTX_set1_req()\fR, and \fIOSSL_HTTP_REQ_CTX_set_expected()\fR
return 1 for success and 0 for failure.
.PP
\&\fIOSSL_HTTP_REQ_CTX_nbio()\fR and \fIOSSL_HTTP_REQ_CTX_nbio_d2i()\fR
return 1 for success, 0 on error or redirection, \-1 if retry is needed.
.PP
\&\fIOSSL_HTTP_REQ_CTX_exchange()\fR and \fIOSSL_HTTP_REQ_CTX_get0_mem_bio()\fR
return a pointer to a \fB\s-1BIO\s0\fR on success as described above or \s-1NULL\s0 on failure.
The returned \s-1BIO\s0 must not be freed by the caller.
.PP
\&\fIOSSL_HTTP_REQ_CTX_get_resp_len()\fR returns the size of the response contents
or 0 if not available or an error occurred.
.PP
\&\fIOSSL_HTTP_is_alive()\fR returns 1 if its argument is non-NULL
and the client requested a persistent connection
and the server did not disagree on keeping the connection open, else 0.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIBIO_should_retry\fR\|(3),
\&\fIBIO_wait\fR\|(3),
\&\fIASN1_item_d2i_bio\fR\|(3),
\&\fIASN1_item_i2d_mem_bio\fR\|(3),
\&\fIOSSL_HTTP_open\fR\|(3),
\&\fIOSSL_HTTP_get\fR\|(3),
\&\fIOSSL_HTTP_transfer\fR\|(3),
\&\fIOSSL_HTTP_close\fR\|(3),
\&\fIOSSL_trace_enabled\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The functions described here were added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2024 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.