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libxml2 Reference Manual |
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nanohttp - minimal HTTP implementation
minimal HTTP implementation allowing to fetch resources like external subset.
Author(s): Daniel Veillard
int xmlNanoHTTPRead (void * ctx,
void * dest,
int len); int xmlNanoHTTPSave (void * ctxt,
const char * filename); const char * xmlNanoHTTPRedir (void * ctx); const char * xmlNanoHTTPAuthHeader (void * ctx); int xmlNanoHTTPFetch (const char * URL,
const char * filename,
char ** contentType); int xmlNanoHTTPContentLength (void * ctx); const char * xmlNanoHTTPMimeType (void * ctx); void xmlNanoHTTPClose (void * ctx); void xmlNanoHTTPCleanup (void); void * xmlNanoHTTPMethod (const char * URL,
const char * method,
const char * input,
char ** contentType,
const char * headers,
int ilen); void xmlNanoHTTPInit (void); void * xmlNanoHTTPOpen (const char * URL,
char ** contentType); void * xmlNanoHTTPOpenRedir (const char * URL,
char ** contentType,
char ** redir); void * xmlNanoHTTPMethodRedir (const char * URL,
const char * method,
const char * input,
char ** contentType,
char ** redir,
const char * headers,
int ilen); void xmlNanoHTTPScanProxy (const char * URL); const char * xmlNanoHTTPEncoding (void * ctx); int xmlNanoHTTPReturnCode (void * ctx);
const char * xmlNanoHTTPAuthHeader (void * ctx)
Get the authentication header of an HTTP context
| ctx: | the HTTP context |
| Returns: | the stashed value of the WWW-Authenticate or Proxy-Authenticate header. |
void xmlNanoHTTPClose (void * ctx)
This function closes an HTTP context, it ends up the connection and free all data related to it.
| ctx: | the HTTP context |
int xmlNanoHTTPContentLength (void * ctx)
Provides the specified content length from the HTTP header.
| ctx: | the HTTP context |
| Returns: | the specified content length from the HTTP header. Note that a value of -1 indicates that the content length element was not included in the response header. |
const char * xmlNanoHTTPEncoding (void * ctx)
Provides the specified encoding if specified in the HTTP headers.
| ctx: | the HTTP context |
| Returns: | the specified encoding or NULL if not available |
int xmlNanoHTTPFetch (const char * URL,
const char * filename,
char ** contentType)
This function try to fetch the indicated resource via HTTP GET and save it's content in the file.
| URL: | The URL to load |
| filename: | the filename where the content should be saved |
| contentType: | if available the Content-Type information will be returned at that location |
| Returns: | -1 in case of failure, 0 incase of success. The contentType, if provided must be freed by the caller |
void xmlNanoHTTPInit (void)
Initialize the HTTP protocol layer. Currently it just checks for proxy informations
void * xmlNanoHTTPMethod (const char * URL,
const char * method,
const char * input,
char ** contentType,
const char * headers,
int ilen)
This function try to open a connection to the indicated resource via HTTP using the given @method, adding the given extra headers and the input buffer for the request content.
| URL: | The URL to load |
| method: | the HTTP method to use |
| input: | the input string if any |
| contentType: | the Content-Type information IN and OUT |
| headers: | the extra headers |
| ilen: | input length |
| Returns: | NULL in case of failure, otherwise a request handler. The contentType, if provided must be freed by the caller |
void * xmlNanoHTTPMethodRedir (const char * URL,
const char * method,
const char * input,
char ** contentType,
char ** redir,
const char * headers,
int ilen)
This function try to open a connection to the indicated resource via HTTP using the given @method, adding the given extra headers and the input buffer for the request content.
| URL: | The URL to load |
| method: | the HTTP method to use |
| input: | the input string if any |
| contentType: | the Content-Type information IN and OUT |
| redir: | the redirected URL OUT |
| headers: | the extra headers |
| ilen: | input length |
| Returns: | NULL in case of failure, otherwise a request handler. The contentType, or redir, if provided must be freed by the caller |
const char * xmlNanoHTTPMimeType (void * ctx)
Provides the specified Mime-Type if specified in the HTTP headers.
| ctx: | the HTTP context |
| Returns: | the specified Mime-Type or NULL if not available |
void * xmlNanoHTTPOpen (const char * URL,
char ** contentType)
This function try to open a connection to the indicated resource via HTTP GET.
| URL: | The URL to load |
| contentType: | if available the Content-Type information will be returned at that location |
| Returns: | NULL in case of failure, otherwise a request handler. The contentType, if provided must be freed by the caller |
void * xmlNanoHTTPOpenRedir (const char * URL,
char ** contentType,
char ** redir)
This function try to open a connection to the indicated resource via HTTP GET.
| URL: | The URL to load |
| contentType: | if available the Content-Type information will be returned at that location |
| redir: | if available the redirected URL will be returned |
| Returns: | NULL in case of failure, otherwise a request handler. The contentType, if provided must be freed by the caller |
int xmlNanoHTTPRead (void * ctx,
void * dest,
int len)
This function tries to read @len bytes from the existing HTTP connection and saves them in @dest. This is a blocking call.
| ctx: | the HTTP context |
| dest: | a buffer |
| len: | the buffer length |
| Returns: | the number of byte read. 0 is an indication of an end of connection. -1 indicates a parameter error. |
const char * xmlNanoHTTPRedir (void * ctx)
Provides the specified redirection URL if available from the HTTP header.
| ctx: | the HTTP context |
| Returns: | the specified redirection URL or NULL if not redirected. |
int xmlNanoHTTPReturnCode (void * ctx)
Get the latest HTTP return code received
| ctx: | the HTTP context |
| Returns: | the HTTP return code for the request. |
int xmlNanoHTTPSave (void * ctxt,
const char * filename)
This function saves the output of the HTTP transaction to a file It closes and free the context at the end
| ctxt: | the HTTP context |
| filename: | the filename where the content should be saved |
| Returns: | -1 in case of failure, 0 incase of success. |
void xmlNanoHTTPScanProxy (const char * URL)
(Re)Initialize the HTTP Proxy context by parsing the URL and finding the protocol host port it indicates. Should be like http://myproxy/ or http://myproxy:3128/ A NULL URL cleans up proxy informations.
| URL: | The proxy URL used to initialize the proxy context |