Error handling

If the problem occurs on the EasyCurl side then AbstractCurlError exception will be thrown.

EasyCurl.AbstractCurlError — Type

AbstractCurlError <: Exception

Abstract base type for exceptions related to LibCURL errors.

Concrete subtypes:

CurlEasyError: Errors from the libcurl easy interface.
CurlMultiError: Errors from the libcurl multi interface.

All subtypes provide:

code::Int: Numeric libcurl error code.
message::String: Human-readable libcurl error message.

See libcurl error codes for more details.

source

EasyCurl.CurlEasyError — Type

CurlEasyError <: AbstractCurlError

Represents an error from a libcurl easy interface call.

Fields

code::Int: The libcurl error code.
message::String: The corresponding error message from libcurl.
diagnostics::CurlDiagnostics: diagnostic struct, that will contain virtually all context info if available

Examples

julia> curl_easy_setopt(c, 1, 1)
ERROR: CurlEasyError{48}: An unknown option was passed in to libcurl

source

EasyCurl.CurlMultiError — Type

CurlMultiError <: AbstractCurlError

Represents an error from a libcurl multi interface call.

Fields

code::Int: The libcurl multi error code.
message::String: The corresponding error message from libcurl.
diagnostics::CurlDiagnostics: diagnostic struct, that will contain virtually all context info if available

Examples

julia> curl_multi_add_handle(c)
ERROR: CurlMultiError{1}: Invalid multi handle

source

Or, if the problem was caused by HHTP, a HTTPStatusError exception will be thrown.

EasyCurl.HTTPStatusError — Type

HTTPStatusError{code} <: Exception

Type wrapping HTTP error codes. Returned from http_request when an HTTP error occurs.

Fields

code::Int64: The HTTP error code (see HTTP_STATUS_CODES).
message::String: The error message.
response::HTTPResponse: The HTTP response object.

Examples

julia> http_request("GET", "http://httpbin.org/status/400")
ERROR: HTTPStatusError{400}: BAD_REQUEST
[...]

julia> http_request("GET", "http://httpbin.org/status/404")
ERROR: HTTPStatusError{404}: NOT_FOUND
[...]

source

Below are some small examples of error handling.

Example

Classic way of error handling:

using EasyCurl

try
    http_request("GET", "http://httpbin.org/status/400"; read_timeout = 30)
    # If the request is successful, you can process the response here
    # ...
catch e
    if isa(e, CurlEasyError)
        if e.code == EasyCurl.CURLE_COULDNT_CONNECT
            # Handle the case where the connection to the server could not be made
        elseif e.code == EasyCurl.CURLE_OPERATION_TIMEDOUT
            # Handle the case where the operation timed out
        end
    elseif isa(e, HTTPStatusError)
        if e.code == 400
            # Handle a 400 Bad Request error specifically
        end
    end
    rethrow(e)
end

Handling errors using error codes as a type parameter:

using EasyCurl

try
    http_request("GET", "http://httpbin.org/status/400"; read_timeout = 30)
    # If the request is successful, you can process the response here
    # ...
catch e
    if isa(e, CurlEasyError{EasyCurl.CURLE_COULDNT_CONNECT})
        # Handle the case where the connection to the server could not be made
    elseif isa(e, CurlEasyError{EasyCurl.CURLE_OPERATION_TIMEDOUT})
        # Handle the case where the operation timed out
    elseif isa(e, HTTPStatusError{400})
        # Handle a 400 Bad Request error specifically
    end
    rethrow(e)
end