NAME

       pmhttpNewClient, pmhttpFreeClient, pmhttpClientFetch - simple HTTP client interfaces

C SYNOPSIS

       #include <pcp/pmapi.h>
       #include <pcp/pmhttp.h>

       struct http_client *pmhttpNewClient(void);
       void pmhttpFreeClient(struct http_client *client);
       int pmhttpClientFetch(struct http_client *client, const char *url, char *bodybuf, size_t
               bodylen, char *typebuf, size_t typelen);

       cc ... -lpcp_web

DESCRIPTION

       pmhttpNewClient allocates and initializes an opaque HTTP client  that  is  ready  to  make
       requests from a server.

       The  URL  request  interface  pmhttpClientFetch  issues  an HTTP GET request to the server
       specified in the supplied url.  The body  of  the  response  is  returned  in  the  caller
       supplied  bodybuf buffer, of bodylen bytes length.  An optional typebuf buffer, of typelen
       bytes length, can also be supplied and  (if  non-NULL)  will  contain  the  value  of  the
       content-type header returned from the server.

       The  url  parameter  is  an  RFC1630  format  URL.   This  will typically be prefixed with
       "http://", however these interfaces also support Unix domain sockets.  Those  are  instead
       prefixed  by  "unix://",  followed  by the full filesystem path to the desired Unix domain
       socket.

       To free up resources associated with an HTTP  client,  including  closing  any  persistent
       server   connection   that  has  been  established  earlier,  is  accomplished  using  the
       pmhttpFreeClient routine.

DIAGNOSTICS

       pmhttpNewClient will return NULL on failure, which  can  only  occur  when  allocation  of
       memory is not possible.

       pmhttpClientFetch  will  return the number of bytes places into the bodybuf buffer, else a
       negated error code indicating the nature of the failure.

SEE ALSO

       pmdaapache(1),         pmjsonInit(3),          PMAPI(3),          PMWEBAPI(3)          and
       https://tools.ietf.org/html/rfc1630.