Documentation

External program run for each feed element.

Data is passed to that program through standard input (stdin).

Define a HTTP proxy, consisting of a hostname and port number.

An exception which may be generated by this library

Since: http-client-0.5.0

Keeps track of open connections for keep-alive.

If possible, you should share a single Manager between multiple threads and requests.

Since 0.1.0

Status of streaming a request body from a file.

Since 0.4.9

How the HTTP proxy server settings should be discovered.

Since 0.4.7

Settings for a Manager. Please use the defaultManagerSettings function and then modify individual settings. For more information, see http://www.yesodweb.com/book/settings-types.

Since 0.1.0

A simple representation of the HTTP response.

Since 0.1.0

How to deal with timing out on retrieval of response headers.

Since: http-client-0.5.0

All information on how to connect to a host and what should be sent in the HTTP request.

If you simply wish to download from a URL, see parseRequest.

The constructor for this data type is not exposed. Instead, you should use either the defaultRequest value, or parseRequest to construct from a URL, and then use the records below to make modifications. This approach allows http-client to add configuration options without breaking backwards compatibility.

For example, to construct a POST request, you could do something like:

initReq <- parseRequest "http://www.example.com/path"
let req = initReq
            { method = "POST"
            }

For more information, please see http://www.yesodweb.com/book/settings-types.

Since 0.1.0

A function which will provide a Popper to a NeedsPopper. This seemingly convoluted structure allows for creation of request bodies which allocate scarce resources in an exception safe manner.

Since 0.1.0

A function which must be provided with a Popper.

Since 0.1.0

A function which generates successive chunks of a request body, provider a single empty bytestring when no more data is available.

Since 0.1.0

When using one of the RequestBodyStream / RequestBodyStreamChunked constructors, you must ensure that the GivesPopper can be called multiple times. Usually this is not a problem.

The RequestBodyStreamChunked will send a chunked request body. Note that not all servers support this. Only use RequestBodyStreamChunked if you know the server you're sending to supports chunked request bodies.

Since 0.1.0

An IO action that represents an incoming response body coming from the server. Data provided by this action has already been gunzipped and de-chunked, and respects any content-length headers present.

The action gets a single chunk of data from the response body, or an empty bytestring if no more data is available.

Since 0.4.0

A datatype holding information on redirected requests and the final response.

Since 0.4.1

Data structure passed to the external program, through JSON format.

The data schema is described in file schema/imm.json, provided with this library.

Feed location identifies a feed. It is either: - the feed URI - a webpage URI that refers to the feed through an alternate link, in which case an optional feed title can be provided to disambiguate multiple such links

Database identifier for a feed

A query describes a set of feeds through some criteria.

Create a Manager. The Manager will be shut down automatically via garbage collection.

Creating a new Manager is a relatively expensive operation, you are advised to share a single Manager between requests instead.

The first argument to this function is often defaultManagerSettings, though add-on libraries may provide a recommended replacement.

Since 0.1.0

Instead of (==).

Since there was some confusion in the history of this library about how the Eq instance should work, it was removed for clarity, and replaced by equal and equiv. equal gives you equality of all fields of the Cookie record.

Since: http-client-0.7.0

Equality of name, domain, path only. This corresponds to step 11 of the algorithm described in Section 5.3 "Storage Model". See also: equal.

Since: http-client-0.7.0

Instead of instance Ord Cookie. See equalCookie, equivCookie.

Since: http-client-0.7.0

See equalCookie.

Since: http-client-0.7.0

See equalCookieJar, equalCookie.

Since: http-client-0.7.0

Create a new Connection from a read, write, and close function.

Since: http-client-0.5.3

Create a new Connection from a Socket.

Since: http-client-0.5.3

strippedHostName takes a URI host name, as extracted by regName, and strips square brackets around IPv6 addresses.

The result is suitable for passing to services such as name resolution (getAddr).

@since

Get a single chunk of data from the response body, or an empty bytestring if no more data is available.

Note that in order to consume the entire request body, you will need to repeatedly call this function until you receive an empty ByteString as a result.

Since 0.1.0

Continuously call brRead, building up a lazy ByteString until a chunk is constructed that is at least as many bytes as requested.

Since 0.4.20

Strictly consume all remaining chunks of data from the stream.

Since 0.1.0

Deprecated synonym for parseUrlThrow. You probably want parseRequest or parseRequest_ instead.

Since: http-client-0.1.0

Same as parseRequest, except will throw an HttpException in the event of a non-2XX response. This uses throwErrorStatusCodes to implement checkResponse.

Since: http-client-0.4.30

Throws a StatusCodeException wrapped in HttpExceptionRequest, if the response's status code indicates an error (if it isn't 2xx). This can be used to implement checkResponse.

Since: http-client-0.5.13

Convert a URL into a Request.

This function defaults some of the values in Request, such as setting method to GET and requestHeaders to [].

Since this function uses MonadThrow, the return monad can be anything that is an instance of MonadThrow, such as IO or Maybe.

You can place the request method at the beginning of the URL separated by a space, e.g.:

parseRequest "POST http://httpbin.org/post"

Note that the request method must be provided as all capital letters.

A Request created by this function won't cause exceptions on non-2XX response status codes.

To create a request which throws on non-2XX status codes, see parseUrlThrow

Since: http-client-0.4.30

Same as parseRequest, but parse errors cause an impure exception. Mostly useful for static strings which are known to be correctly formatted.

Convert a URI into a Request.

This can fail if the given URI is not absolute, or if the URI scheme is not "http" or "https". In these cases the function will throw an error via MonadThrow.

This function defaults some of the values in Request, such as setting method to GET and requestHeaders to [].

A Request created by this function won't cause exceptions on non-2XX response status codes.

Since: http-client-0.5.12

Same as requestFromURI, but if the conversion would fail, throws an impure exception.

Since: http-client-0.5.12

Extract a URI from the request.

Since 0.1.0

A default request value, a GET request of localhost/:80, with an empty request body.

Note that the default checkResponse does nothing.

Since: http-client-0.4.30

Add a Basic Auth header (with the specified user name and password) to the given Request. Ignore error handling:

 applyBasicAuth "user" "pass" $ parseRequest_ url

NOTE: The function applyDigestAuth is provided by the http-client-tls package instead of this package due to extra dependencies. Please use that package if you need to use digest authentication.

Since 0.1.0

Add a Bearer Auth header to the given Request

Since: http-client-0.7.6

Add a Proxy-Authorization header (with the specified username and password) to the given Request. Ignore error handling:

applyBasicProxyAuth "user" "pass" <$> parseRequest "http://example.org"

Since 0.3.4

Add url-encoded parameters to the Request.

This sets a new requestBody, adds a content-type request header and changes the method to POST.

Since 0.1.0

Modify the request so that non-2XX status codes do not generate a runtime StatusCodeException.

Since: http-client-0.4.29

Modify the request so that non-2XX status codes generate a runtime StatusCodeException, by using throwErrorStatusCodes

Since: http-client-0.5.13

Set the query string to the given key/value pairs.

Since 0.3.6

Set the query string to the given key/value pairs.

Since: http-client-0.5.10

Send a file as the request body.

It is expected that the file size does not change between calling streamFile and making any requests using this request body.

Since 0.4.9

Send a file as the request body, while observing streaming progress via a PopObserver. Observations are made between reading and sending a chunk.

It is expected that the file size does not change between calling observedStreamFile and making any requests using this request body.

Since 0.4.9

Retrieve the orignal Request from a Response

Note that the requestBody is not available and always set to empty.

Since: http-client-0.7.8

A value for the managerRawConnection setting, but also allows you to modify the underlying Socket to set additional settings. For a motivating use case, see: https://github.com/snoyberg/http-client/issues/71.

Since 0.3.8

Same as rawConnectionModifySocket, but also takes in a chunk size.

Since: http-client-0.5.2

Default value for ManagerSettings.

Note that this value does not have support for SSL/TLS. If you need to make any https connections, please use the http-client-tls package, which provides a tlsManagerSettings value.

Since 0.1.0

Close all connections in a Manager.

Note that this doesn't affect currently in-flight connections, meaning you can safely use it without hurting any queries you may have concurrently running.

Since 0.1.0

Create, use and close a Manager.

Since 0.2.1

Get the proxy settings from the Request itself.

Since 0.4.7

Never connect using a proxy, regardless of the proxy value in the Request.

Since 0.4.7

Use the given proxy settings, regardless of the proxy value in the Request.

Since 0.4.7

Send secure requests to the proxy in plain text rather than using CONNECT, regardless of the value in the Request.

Since: http-client-0.7.2

Get the proxy settings from the default environment variable (http_proxy for insecure, https_proxy for secure). If no variable is set, then fall back to the given value. Nothing is equivalent to noProxy, Just is equivalent to useProxy.

Since 0.4.7

Same as proxyEnvironment, but instead of default environment variable names, allows you to set your own name.

Since 0.4.7

The default proxy settings for a manager. In particular: if the http_proxy (or https_proxy) environment variable is set, use it. Otherwise, use the values in the Request.

Since 0.4.7

This corresponds to the subcomponent algorithm entitled "Domain Matching" detailed in section 5.1.3

This corresponds to the subcomponent algorithm entitled "Paths" detailed in section 5.1.4

This corresponds to the subcomponent algorithm entitled "Path-Match" detailed in section 5.1.4

Algorithm described in "Secure Contexts", Section 3.1, "Is origin potentially trustworthy?"

Note per RFC6265 section 5.4 user agent is free to define the meaning of "secure" protocol.

See: https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy

This corresponds to the eviction algorithm described in Section 5.3 "Storage Model"

This applies the computeCookieString to a given Request

This corresponds to the algorithm described in Section 5.4 "The Cookie Header"

This applies receiveSetCookie to a given Response

This corresponds to the algorithm described in Section 5.3 "Storage Model" This function consists of calling generateCookie followed by insertCheckedCookie. Use this function if you plan to do both in a row. generateCookie and insertCheckedCookie are only provided for more fine-grained control.

Insert a cookie created by generateCookie into the cookie jar (or not if it shouldn't be allowed in)

Turn a SetCookie into a Cookie, if it is valid

Perform a Request using a connection acquired from the given Manager, and then provide the Response to the given function. This function is fully exception safe, guaranteeing that the response will be closed when the inner function exits. It is defined as:

withResponse req man f = bracket (responseOpen req man) responseClose f

It is recommended that you use this function in place of explicit calls to responseOpen and responseClose.

You will need to use functions such as brRead to consume the response body.

Since 0.1.0

A convenience wrapper around withResponse which reads in the entire response body and immediately closes the connection. Note that this function performs fully strict I/O, and only uses a lazy ByteString in its response for memory efficiency. If you are anticipating a large response body, you are encouraged to use withResponse and brRead instead.

Since 0.1.0

A convenient wrapper around withResponse which ignores the response body. This is useful, for example, when performing a HEAD request.

Since 0.3.2

The most low-level function for initiating an HTTP request.

The first argument to this function gives a full specification on the request: the host to connect to, whether to use SSL, headers, etc. Please see Request for full details. The second argument specifies which Manager should be used.

This function then returns a Response with a BodyReader. The Response contains the status code and headers that were sent back to us, and the BodyReader contains the body of the request. Note that this BodyReader allows you to have fully interleaved IO actions during your HTTP download, making it possible to download very large responses in constant memory.

An important note: the response body returned by this function represents a live HTTP connection. As such, if you do not use the response body, an open socket will be retained indefinitely. You must be certain to call responseClose on this response to free up resources.

This function automatically performs any necessary redirects, as specified by the redirectCount setting.

When implementing a (reverse) proxy using this function or relating functions, it's wise to remove Transfer-Encoding:, Content-Length:, Content-Encoding: and Accept-Encoding: from request and response headers to be relayed.

Since 0.1.0

Close any open resources associated with the given Response. In general, this will either close an active Connection or return it to the Manager to be reused.

Since 0.1.0

Perform an action using a Connection acquired from the given Manager.

You should use this only when you have to read and write interactively through the connection (e.g. connection by the WebSocket protocol).

Since: http-client-0.5.13

A variant of responseOpen which keeps a history of all redirects performed in the interim, together with the first 1024 bytes of their response bodies.

Since 0.4.1

A variant of withResponse which keeps a history of all redirects performed in the interim, together with the first 1024 bytes of their response bodies.

Since 0.4.1

Set the proxy override value, only for HTTP (insecure) connections.

Since 0.4.7

Set the proxy override value, only for HTTPS (secure) connections.

Since 0.4.7

Set the proxy override value, for both HTTP (insecure) and HTTPS (insecure) connections.

Since 0.4.7

Specify maximum time in microseconds the retrieval of response headers is allowed to take

Since: http-client-0.5.0

Do not have a response timeout

Since: http-client-0.5.0

Use the default response timeout

When used on a Request, means: use the manager's timeout value

When used on a ManagerSettings, means: default to 30 seconds

Since: http-client-0.5.0

Conduit version of parseFeed

Simple wrapper around _withGet that also logs the requested URI.