HttpResponse Lazarus Pascal Reference Documentation
HttpResponse
Current Version: 11.6.0
Chilkat.HttpResponse
Read the HTTP status code, status line, and related response information
to determine whether the request succeeded, redirected, or failed.
Inspect response headers, retrieve individual header values, and access
cookies returned by the server.
Get the response body as raw bytes or decoded text, using the response
charset information when appropriate.
Load the body directly into
Access redirect-related information such as the redirect URL when the
server responds with a redirect status.
Save body content, inspect the full MIME-style response, and use response
metadata for diagnostics, logging, or API troubleshooting.
For an extended overview, see
HttpResponse Class Overview.
Inspect HTTP status, headers, cookies, redirects, and response bodies.
Chilkat.HttpResponse represents an HTTP response returned by
certain Chilkat.Http methods. It provides access to the response
status line, status code, headers, cookies, charset, content length, body
bytes, body text, full MIME response, redirect URL, and helper methods for
saving or loading the response body into Chilkat objects such as
BinData, StringBuilder, JsonObject,
JsonArray, and Xml.
Status and reason
Headers and cookies
Body as text or bytes
Structured body loading
JsonObject,
JsonArray, Xml, BinData, or
StringBuilder objects for further processing.
Redirect information
Save and inspect responses
Chilkat.Http, check the
StatusCode, inspect headers or cookies as needed, then retrieve
the body in the form best suited to the response content: text, bytes,
BinData, StringBuilder, JSON, or XML. Use
HttpResponse for response inspection; use Chilkat.Http
for the actual network request.
Create / Free
uses
Chilkat.HttpResponse;
var
obj: THttpResponse;
begin
obj := THttpResponse.Create;
try
if not obj.IsValid then
raise Exception.Create('Failed to create a THttpResponse instance.');
// ... use obj ...
finally
obj.Free;
end;
end;
Allocates the underlying CkHttpResponse object and returns a new THttpResponse instance. Simply adding Chilkat.HttpResponse to the unit's uses clause is enough to locate and bind to the Chilkat shared library (DLL / .so / .dylib) at runtime — no separate load step is required. Check obj.IsValid after calling Create; it is False if the underlying library could not be found/loaded or the object could not be allocated (for example, when unlicensed).
Every THttpResponse created by calling Create should eventually be released by calling .Free (inherited from TObject). The destructor automatically disposes the underlying CkHttpResponse handle. A native (unmanaged) memory leak occurs if the object is never freed.
Properties
Body
The response body returned as a byte array.
topBodyQP
The same as the Body property, but returned as a quoted-printable encoded string.
topBodyStr
The response body returned as a string.
topCharset
The response charset, such as iso-8859-1, if applicable. Obviously, responses for GIF and JPG files will not have a charset.
ContentLength
The content length of the response, in bytes.
topContentLength64
The content length of the response, in number of bytes, returned as a 64-bit integer.
topDateStr
Returns the content of the Date response header field in RFC822 date/time string format.
topDebugLogFilePath
If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. This logging helps identify the context and history of Chilkat calls leading up to any crash or hang, aiding in debugging.
Enabling the VerboseLogging property provides more detailed information. This property is mainly used for debugging rare instances where a Chilkat method call causes a hang or crash, which should generally not happen.
Possible causes of hangs include:
- A timeout property set to 0, indicating an infinite timeout.
- A hang occurring within an event callback in the application code.
- An internal bug in the Chilkat code causing the hang.
Domain
The domain of the HTTP server that created this response.
topFinalRedirectUrl
Returns the redirect URL for 301/302 responses.
topFullMime
Header
The full text of the response header.
topLastErrorHtml
Provides HTML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.
topLastErrorText
Provides plain text information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.
LastErrorXml
Provides XML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.
topLastMethodSuccess
Indicates the success or failure of the most recent method call: True means success, False means failure. This property remains unchanged by property setters or getters. This method is present to address challenges in checking for null or Nothing returns in certain programming languages. Note: This property does not apply to methods that return integer values or to boolean-returning methods where the boolean does not indicate success or failure.
NumCookies
The number of cookies included in the response.
topNumHeaderFields
The number of response header fields.
topStatusCode
The status code (as an integer) from the first line of an HTTP response. If the StatusLine = HTTP/1.0 200 OK, the response status code returned is 200.
StatusLine
The first line of an HTTP response, such as HTTP/1.0 200 OK.
StatusText
The text that follows the status code in the 1st line of the HTTP response. For example, i the first line of an HTTP response is HTTP/1.0 200 OK, then this property contains OK.
UncommonOptions
This is a catch-all property to be used for uncommon needs. Can be set to a list of the following comma separated keywords:
TakeResponseBody- Introduced in v9.5.0.89. The GetBody* methods will transfer the body to the target object instead of copying the contents. This can be useful if the response body is extremely large because it will reduce the overall memory requirement.
VerboseLogging
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.
Version
Methods
GetBodyBd
function GetBodyBd(binData: TChilkatBase): Boolean;
Copies the response body to a BinData object.
Returns True for success, False for failure.
GetBodyJarr
function GetBodyJarr(jarr: TChilkatBase): Boolean;
Loads the JSON array response body into a JsonArray This method should only be called when it is known that the response body contains a JSON array (beginning with a square bracket '[' and ending with a square bracket ']')
Returns True for success, False for failure.
GetBodyJson
function GetBodyJson(json: TChilkatBase): Boolean;
Loads the JSON response body into a JsonObject. This method should only be called when it is known that the response body contains JSON (beginning with a curly brace '{' and ending with a curly brace '}')
Returns True for success, False for failure.
GetBodySb
function GetBodySb(sb: TChilkatBase): Boolean;
Copies the response body to a Chilkat StringBuilder object.
Returns True for success, False for failure.
topGetBodyXml
function GetBodyXml(xml: TChilkatBase): Boolean;
Loads the XML response body into an XML object. This method should only be called when it is known that the response body contains XML.
Returns True for success, False for failure.
GetCookieDomain
Returns the domain of the Nth cookie in the response. Indexing begins at 0. The number of response cookies is specified in the NumCookies property.
Returns True for success, False for failure.
topGetCookieExpiresStr
Returns the expiration date/time of the Nth cookie in the response. Indexing begins at 0. The number of response cookies is specified in the NumCookies property.
Returns True for success, False for failure.
topGetCookieName
Returns the name of the Nth cookie returned in the response. Indexing begins at 0. The number of response cookies is specified in the NumCookies property.
Returns True for success, False for failure.
topGetCookiePath
Returns the path of the Nth cookie returned in the response. Indexing begins at 0. The number of response cookies is specified in the NumCookies property.
Returns True for success, False for failure.
topGetCookieValue
Returns the value of the Nth cookie returned in the response. Indexing begins at 0. The number of response cookies is specified in the NumCookies property.
Returns True for success, False for failure.
topGetHeaderField
Returns the value of a response header field accessed by field name.
Returns True for success, False for failure.
topGetHeaderFieldAttr
const attrName: string): string;
Returns a response header field attribute. As an example, the response charset is simply the GetHeaderFieldAttr(content-type,charset)
Returns True for success, False for failure.
topGetHeaderName
Gets the name of the Nth response header field. Indexing begins at 0. The number of response headers is specified by the NumHeaderFields property.
Returns True for success, False for failure.
topGetHeaderValue
Gets the value of the Nth response header field. Indexing begins at 0. The number of response headers is specified by the NumHeaderFields property.
Returns True for success, False for failure.
topLoadTaskResult
function LoadTaskResult(task: TChilkatBase): Boolean;
Loads the HTTP response from a completed asynchronous task. A failed return value indicates that no HTTP response was received in the HTTP asynchronous method call (i.e. the asynchronous HTTP request failed in such a way that no response was received).
Returns True for success, False for failure.
topSaveBodyBinary
Saves the body of the HTTP response to a file.
Returns True for success, False for failure.
SaveBodyText
const path: string): Boolean;
Saves the HTTP response body to a file. This method provides control over CRLF vs bare-LF line-endings. If bCrlf is True, then line endings are automatically converted to CRLF if necessary. If bCrlf is False, then line-endings are automatically converted to bare-LF's (Unix style) if necessary.
To save the HTTP response body exactly as-is (with no line-ending manipulation), then call SaveBodyBinary.
Returns True for success, False for failure.
topUrlEncParamValue
const paramName: string): string;
Convenience method for parsing a param's value out of a URL-encoded param string. For example, if a caller passes the following string in encodedParamString:
oauth_token=ABC&oauth_token_secret=123&oauth_callback_confirmed=trueand
oauth_token_secret in paramName, then the return value would be 123.Returns True for success, False for failure.
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