HttpRequest DataFlex Reference Documentation

HttpRequest

Represents a complete HTTP request.

Object Creation

Handle hoHttpRequest
Get Create(RefClass(cComChilkatHttpRequest)) to hoHttpRequest

Properties

Function ComBoundary Returns String
Procedure Set ComBoundary String value

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.

HTTP Request Boundary Property

Function ComCharset Returns String
Procedure Set ComCharset String value

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 True.

Function ComContentType Returns String
Procedure Set ComContentType String value

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
text/xml
application/jsonrequest
If ContentType is set equal to the empty string, then no Content-Type header is included in the HTTP request.

Building a multipart/form-data Request for HTTP Upload

Creating an application/json HTTP POST Request

Function ComDebugLogFilePath Returns String
Procedure Set ComDebugLogFilePath String value

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.

Function ComEntireHeader Returns String
Procedure Set ComEntireHeader String value

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

Function ComHttpVerb Returns String
Procedure Set ComHttpVerb String value

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.

HTTP Verb - How to use any Verb (GET, PUT, POST, DELETE, PROPFIND, etc.)

Function ComHttpVersion Returns String
Procedure Set ComHttpVersion String value

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

Function ComLastBinaryResult Returns Variant

Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to True. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

Function ComLastErrorHtml Returns String

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.

Function ComLastErrorText Returns String

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.

Concept of LastErrorText

LastErrorText Standard Information

Function ComLastErrorXml Returns String

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.

Function ComLastMethodSuccess Returns Boolean
Procedure Set ComLastMethodSuccess Boolean value

Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False 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 = True and failure = False.
  • 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 True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

Function ComLastStringResult Returns String

Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to True. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

Long Strings Returned by ActiveX Methods in SQL Server

Function ComLastStringResultLen Returns Integer

Introduced in version 9.5.0.53

The length, in characters, of the string contained in the LastStringResult property.

Function ComNumHeaderFields Returns Integer

Returns the number of request header fields.

Function ComNumParams Returns Integer

Returns the number of query parameters.

Initialize an HTTP Request from a URL

Function ComPath Returns String
Procedure Set ComPath String value

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

Explaining the Path Part of a URL

Function ComSendCharset Returns Boolean
Procedure Set ComSendCharset Boolean value

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 False.

Function ComVerboseLogging Returns Boolean
Procedure Set ComVerboseLogging Boolean value

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

Function ComVersion Returns String

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

Methods

Function ComAddBytesForUpload String name String remoteFileName Variant byteData Returns Boolean

Adds a file to an upload request where the contents of the file come from an in-memory byte array. To create a file upload request, call UseUpload and then call AddBytesForUpload, AddStringForUpload, or AddFileForUpload for each file to be uploaded.

name is an arbitrary name. (In HTML, it is the form field name of the input tag.)
remoteFileName is the name of the file to be created on the HTTP server.
byteData contains the contents (bytes) to be uploaded.

Returns True for success, False for failure.

Function ComAddBytesForUpload2 String name String remoteFileName Variant byteData String contentType Returns Boolean

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

Returns True for success, False for failure.

Function ComAddFileForUpload String name String filePath Returns 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 True for success, False for failure.

(Facebook) Upload Photo from Local File

Function ComAddFileForUpload2 String name String filePath String contentType Returns 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 True for success, False for failure.

SOAP with MTOM XOP Attachment

Procedure ComAddHeader String name String value

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.)

Adding Cookies to an HTTP Request

Function ComAddMwsSignature String domain String mwsSecretKey Returns 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 True for success, False for failure.

HTTPS MWS List Orders (Amazon Marketplace Web Service)

Procedure ComAddParam String name String value

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.

Add Parameters to Multipart Form-Data POSTs

Initialize an HTTP Request from a URL

Function ComAddStringForUpload String name String filename String strData String charset Returns Boolean

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

Returns True for success, False for failure.

Building a multipart/form-data Request for HTTP Upload

Function ComAddStringForUpload2 String name String filename String strData String charset String contentType Returns 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 True for success, False for failure.

HTTP multipart-mixed POST (for a UPS Package Level Detail PLD Request)

Function ComAddSubHeader Integer index String name String value Returns 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 True for success, False for failure.

Function ComGenerateRequestFile String path Returns 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 True for success, False for failure.

Function ComGenerateRequestText Returns String

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

Returns null on failure

Function ComGetHeaderField String name Returns String

Returns the value of a request header field.

Returns null on failure

Function ComGetHeaderName Integer index Returns String

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 null on failure

Function ComGetHeaderValue Integer index Returns String

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 null on failure

Function ComGetParam String name Returns String

Returns a request query parameter value by name.

Returns null on failure

Function ComGetParamName Integer index Returns String

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 null on failure

Initialize an HTTP Request from a URL

Function ComGetParamValue Integer index Returns String

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 null on failure

Initialize an HTTP Request from a URL

Function ComGetUrlEncodedParams Returns String

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<param2=abc%2D123"

Returns null on failure

HTTP multipart-mixed POST (for a UPS Package Level Detail PLD Request)

Function ComLoadBodyFromBd cComChilkatBinData requestBody Returns Boolean

Introduced in version 9.5.0.67

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

Returns True for success, False for failure.

Function ComLoadBodyFromBytes Variant byteData Returns 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 the byteData.
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 True for success, False for failure.

Function ComLoadBodyFromFile String filePath Returns 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 True for success, False for failure.

Function ComLoadBodyFromSb cComChilkatStringBuilder requestBody String charset Returns 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 True for success, False for failure.

Chilkat Supported Character Encodings

Function ComLoadBodyFromString String bodyStr String charset Returns 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 True for success, False for failure.

Creating an application/json HTTP POST Request

Procedure ComRemoveAllParams

Removes all request parameters.

Demonstrate HttpRequest.RemoveAllParams

Function ComRemoveHeader String name Returns Boolean

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

Returns True for success, False for failure.

Procedure ComRemoveParam String name

Removes a single HTTP request parameter by name.

Initialize an HTTP Request from a URL

Procedure ComSetFromUrl String url

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

Initialize an HTTP Request from a URL

Function ComStreamBodyFromFile String filePath Returns 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 True for success, False for failure.

OneDrive -- Streaming File Upload

Function ComStreamChunkFromFile String path String offset String numBytes Returns 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 True for success, False for failure.

Procedure ComUseGet

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).

Procedure ComUseHead

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).

Procedure ComUsePost

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".

Procedure ComUsePostMultipartForm

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".

Procedure ComUsePut

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".

Procedure ComUseUpload

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".

Procedure ComUseUploadPut

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".

Procedure ComUseXmlHttp String xmlBody

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.