HttpRequest Lianja Reference Documentation

HttpRequest

Current Version: 9.5.0.73

Represents a complete HTTP request.

Object Creation

loObject = createobject("CkHttpRequest")

Properties

Boundary
Boundary As Character
Introduced in version 9.5.0.49

Sets an explicit boundary string to be used in multipart/form-data requests. If no Boundary is set, then a boundary string is automaticaly generated as needed during the sending of a request.

More Information and Examples
top
Charset
Charset As Character

Controls the character encoding used for HTTP request parameters for POST requests. The default value is the ANSI charset of the computer. The charset should match the charset expected by the form target.

The "charset" attribute is only included in the Content-Type header of the request if the SendCharset property is set to .T..

top
ContentType
ContentType As Character

The ContentType property sets the "Content-Type" header field, and identifies the content-type of the HTTP request body. Common values are:

application/x-www-form-urlencoded
multipart/form-data
application/json
application/xml
If ContentType is set equal to the empty string, then no Content-Type header is included in the HTTP request.

top
DebugLogFilePath
DebugLogFilePath As Character

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

top
EntireHeader
EntireHeader As Character

Composes and returns the entire MIME header of the HTTP request.

top
HttpVerb
HttpVerb As Character

The HttpVerb property should be set to the name of the HTTP method that appears on the "start line" of an HTTP request, such as GET, POST, PUT, DELETE, etc. It is also possible to use the various WebDav verbs such as PROPFIND, PROPPATCH, MKCOL, COPY, MOVE, LOCK, UNLOCK, etc. In general, the HttpVerb may be set to anything, even custom verbs recognized by a custom server-side app.

top
HttpVersion
HttpVersion As Character

The HTTP version in the request header. Defaults to "1.1".

top
LastErrorHtml
LastErrorHtml As Character (read-only)

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

top
LastErrorText
LastErrorText As Character (read-only)

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

top
LastErrorXml
LastErrorXml As Character (read-only)

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

top
LastMethodSuccess
LastMethodSuccess As Boolean
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of .T. indicates success, a value of .F. indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = .T. and failure = .F..
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to .T.. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

top
NumHeaderFields
NumHeaderFields As Numeric (read-only)

Returns the number of request header fields.

top
NumParams
NumParams As Numeric (read-only)

Returns the number of query parameters.

More Information and Examples
top
Path
Path As Character

The path of the resource requested. A path of "/" indicates the default document for a domain.

More Information and Examples
top
SendCharset
SendCharset As Boolean

Controls whether the charset is explicitly included in the content-type header field of the HTTP POST request. The default value of this property is .F..

top
VerboseLogging
VerboseLogging As Boolean

If set to .T., then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is .F.. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

top
Version
Version As Character (read-only)

Version of the component/library, such as "9.5.0.63"

top

Methods

AddFileForUpload
AddFileForUpload(name As Character, filePath As Character) As Boolean

Adds a file to an upload request. To create a file upload request, call UseUpload and then call AddFileForUpload, AddBytesForUpload, or AddStringForUpload for each file to be uploaded. This method does not read the file into memory. When the upload occurs, the data is streamed directly from the file, thus allowing for very large files to be uploaded without consuming large amounts of memory.

name is an arbitrary name. (In HTML, it is the form field name of the input tag.)
filePath is the path to an existing file in the local filesystem.

Returns .T. for success, .F. for failure.

More Information and Examples
top
AddFileForUpload2
AddFileForUpload2(name As Character, filePath As Character, contentType As Character) As Boolean

Same as AddFileForUpload, but allows the Content-Type header field to be directly specified. (Otherwise, the Content-Type header is automatically determined based on the file extension.)

name is an arbitrary name. (In HTML, it is the form field name of the input tag.)
filePath is the path to an existing file in the local filesystem.

Returns .T. for success, .F. for failure.

More Information and Examples
top
AddHeader
AddHeader(name As Character, value As Character)

Adds a request header to the HTTP request. If a header having the same field name is already present, this method replaces it.

Note: Never explicitly set the Content-Length header field. Chilkat will automatically compute the correct length and add the Content-Length header to all POST, PUT, or any other request where the Content-Length needs to be specified. (GET requests always have a 0 length body, and therefore never need a Content-Length header field.)

More Information and Examples
top
AddMwsSignature
AddMwsSignature(domain As Character, mwsSecretKey As Character) As Boolean
Introduced in version 9.5.0.66

Computes the Amazon MWS signature using the mwsSecretKey and adds the "Signature" parameter to the request. This method should be called for all Amazon Marketplace Web Service (Amazon MWS) HTTP requests. It should be called after all request parameters have been added.

The domain should be the domain of the request, such as one of the following:

  • mws.amazonservices.com
  • mws-eu.amazonservices.com
  • mws.amazonservices.in
  • mws.amazonservices.com.cn
  • mws.amazonservices.jp

Note: This method automatically adds or replaces the existing Timestamp parameter to the current system date/time.

Returns .T. for success, .F. for failure.

top
AddParam
AddParam(name As Character, value As Character)

Adds a request query parameter (name/value pair) to the HTTP request. The name and value strings passed to this method should not be URL encoded.

top
AddStringForUpload
AddStringForUpload(name As Character, filename As Character, strData As Character, charset As Character) As Boolean

Same as AddFileForUpload, but the upload data comes from an in-memory string instead of a file.

Returns .T. for success, .F. for failure.

top
AddStringForUpload2
AddStringForUpload2(name As Character, filename As Character, strData As Character, charset As Character, contentType As Character) As Boolean

Same as AddStringForUpload, but allows the Content-Type header field to be directly specified. (Otherwise, the Content-Type header is automatically determined based on the filename's file extension.)

Returns .T. for success, .F. for failure.

top
AddSubHeader
AddSubHeader(index As Numeric, name As Character, value As Character) As Boolean
Introduced in version 9.5.0.55

Adds a request header to the Nth sub-header of the HTTP request. If a header having the same field name is already present, this method replaces it.

Returns .T. for success, .F. for failure.

top
GenerateRequestFile
GenerateRequestFile(path As Character) As Boolean
Introduced in version 9.5.0.64

The same as GenerateRequestText, except the generated request is written to the file specified by path.

Returns .T. for success, .F. for failure.

top
GenerateRequestText
GenerateRequestText() As Character

Returns the request text that would be sent if Http.SynchronousRequest was called.

Returns .F. on failure

top
GetHeaderField
GetHeaderField(name As Character) As Character

Returns the value of a request header field.

Returns .F. on failure

top
GetHeaderName
GetHeaderName(index As Numeric) As Character

Returns the Nth request header field name. Indexing begins at 0, and the number of request header fields is specified by the NumHeaderFields property.

Returns .F. on failure

top
GetHeaderValue
GetHeaderValue(index As Numeric) As Character

Returns the Nth request header field value. Indexing begins at 0, and the number of request header fields is specified by the NumHeaderFields property.

Returns .F. on failure

top
GetParam
GetParam(name As Character) As Character

Returns a request query parameter value by name.

Returns .F. on failure

top
GetParamName
GetParamName(index As Numeric) As Character

Returns the Nth request query parameter field name. Indexing begins at 0, and the number of request query parameter fields is specified by the NumParams property.

Returns .F. on failure

More Information and Examples
top
GetParamValue
GetParamValue(index As Numeric) As Character

Returns the Nth request query parameter field value. Indexing begins at 0, and the number of request query parameter fields is specified by the NumParams property.

Returns .F. on failure

More Information and Examples
top
GetUrlEncodedParams
GetUrlEncodedParams() As Character

Returns the request parameters in URL encoded form (i.e. in the exact form that would be sent if the ContentType property was application/x-www-form-urlencoded). For example, if a request has two params: param1="abc 123" and param2="abc-123", then GetUrlEncodedParams would return "abc+123

Returns .F. on failure

top
LoadBodyFromBd
LoadBodyFromBd(requestBody As CkBinData) As Boolean
Introduced in version 9.5.0.67

Uses the contents of the requestBody as the HTTP request body.

Returns .T. for success, .F. for failure.

top
LoadBodyFromFile
LoadBodyFromFile(filePath As Character) As Boolean

The HTTP protocol is such that all HTTP requests are MIME. For non-multipart requests, this method may be called to set the MIME body of the HTTP request to the exact contents of filePath.
Note: A non-multipart HTTP request consists of (1) the HTTP start line, (2) MIME header fields, and (3) the MIME body. This method sets the MIME body.

Returns .T. for success, .F. for failure.

top
LoadBodyFromSb
LoadBodyFromSb(requestBody As CkStringBuilder, charset As Character) As Boolean
Introduced in version 9.5.0.67

Uses the contents of the requestBody as the HTTP request body. The charset indicates the binary representation of the string, such as "utf-8", "utf-16", "iso-8859-*", "windows-125*", etc. Any of the character encodings supported at the link below are valid.

Returns .T. for success, .F. for failure.

More Information and Examples
top
LoadBodyFromString
LoadBodyFromString(bodyStr As Character, charset As Character) As Boolean

The HTTP protocol is such that all HTTP requests are MIME. For non-multipart requests, this method may be called to set the MIME body of the HTTP request to the exact contents of bodyStr.
Note: A non-multipart HTTP request consists of (1) the HTTP start line, (2) MIME header fields, and (3) the MIME body. This method sets the MIME body.

charset indicates the charset, such as "utf-8" or "iso-8859-1", to be used. The HTTP body will contain the bodyStr converted to this character encoding.

Returns .T. for success, .F. for failure.

More Information and Examples
top
RemoveAllParams
RemoveAllParams()

Removes all request parameters.

More Information and Examples
top
RemoveHeader
RemoveHeader(name As Character) As Boolean

Removes all occurrences of a HTTP request header field. Always returns .T..

Returns .T. for success, .F. for failure.

top
RemoveParam
RemoveParam(name As Character)

Removes a single HTTP request parameter by name.

More Information and Examples
top
SaveLastError
SaveLastError(path As Character) As Boolean

Saves the last-error information (the contents of LastErrorXml) to an XML formatted file.

Returns .T. for success, .F. for failure.

top
SetFromUrl
SetFromUrl(url As Character)

Parses a URL and sets the Path and query parameters (NumParams, GetParam, GetParamName, GetParamValue).

More Information and Examples
top
StreamBodyFromFile
StreamBodyFromFile(filePath As Character) As Boolean

Useful for sending HTTP requests where the body is a very large file. For example, to send an XML HttpRequest containing a very large XML document, one would set the HttpVerb = "POST", the ContentType = "text/xml", and then call StreamBodyFromFile to indicate that the XML body of the request is to be streamed directly from a file. When the HTTP request is actually sent, the body is streamed directly from the file, and thus the file never needs to be loaded in its entirety in memory.

Returns .T. for success, .F. for failure.

More Information and Examples
top
StreamChunkFromFile
StreamChunkFromFile(path As Character, offset As Character, numBytes As Character) As Boolean
Introduced in version 9.5.0.55

This method is the same as StreamBodyFromFile, but allows for an offset and number of bytes to be specified. The offset and numBytes are integers passed as strings.

Returns .T. for success, .F. for failure.

top
UseGet
UseGet()
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a GET request.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "GET", and the ContentType equal to an empty string (because GET requests have no request body).

top
UseHead
UseHead()
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a HEAD request.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "HEAD", and the ContentType equal to an empty string (because HEAD requests have no body).

top
UsePost
UsePost()
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a POST request that uses the "application/x-www-form-urlencoded" content type.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "POST", and the ContentType equal to "application/x-www-form-urlencoded".

top
UsePostMultipartForm
UsePostMultipartForm()
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a POST request that uses the "multipart/form-data" content type.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "POST", and the ContentType equal to "multipart/form-data".

top
UsePut
UsePut()
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a PUT request.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "PUT", and the ContentType equal to "application/x-www-form-urlencoded".

top
UseUpload
UseUpload()
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a POST request that uses the "multipart/form-data" content type. To create a file upload request, call UseUpload and then call AddFileForUpload for each file to be uploaded.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "POST", and the ContentType equal to "multipart/form-data".

top
UseUploadPut
UseUploadPut()
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a PUT request that uses the "multipart/form-data" content type. To create a file upload request (using the PUT verb), call UseUploadPut and then call AddFileForUpload for each file to be uploaded.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "PUT", and the ContentType equal to "multipart/form-data".

top
UseXmlHttp
UseXmlHttp(xmlBody As Character)
This method is deprecated. It will be removed in a future version.

Makes the HttpRequest a POST request using the "application/xml" content type. The request body is set to the XML string passed to this method.

Important: This method is deprecated. An application should instead set the HttpVerb property equal to "POST", the ContentType equal to "text/xml", and the request body should contain the XML document text.

top