PowerShell脚本无法捕获HTTP请求错误响应头问题求助

问题核心原因 #

你遇到的问题源于HttpWebResponse的Headers是WebHeaderCollection类型，无法直接用GetEnumerator()遍历，必须通过AllKeys属性获取所有头名称后再逐个取值。

具体修复步骤 #

1. 修正错误日志的语法问题
   原脚本中Log-Message "Error Response: $_.ErrorRecord.Exception"存在语法错误，需改为：

Log-Message "Error Response: $($_.ErrorRecord.Exception)"

2. 重构错误响应头的获取逻辑
   将catch块中遍历响应头的代码替换为以下逻辑，确保能正确读取所有响应头：

Log-Message "Error Response Headers:"
if ($ErrorResponse -and $ErrorResponse.Headers) {
    foreach ($headerKey in $ErrorResponse.Headers.AllKeys) {
        $headerValue = $ErrorResponse.Headers.Get($headerKey)
        Log-Message "$headerKey: $headerValue"
    }
} else {
    Log-Message "No error response headers available."
}

完整修正后的脚本 #

# Define the log file path
$logFilePath = "https_test_connection_log.txt"
$apiUrl = "你的目标API地址" # 替换为实际请求URL

# Function to log messages with a timestamp
function Log-Message {
    param (
        [string]$Message
    )
    $timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
    Add-Content -Path $logFilePath -Value "$timestamp - $Message"
}

# Send a GET request to the API
try {
    # Make the HTTP GET request
    $response = Invoke-WebRequest -Uri $apiUrl -Method Get -ErrorAction Stop

    # Log successful response details
    Log-Message "Request to $apiUrl successful."

    # Log response headers if they are available
    if ($response.Headers -ne $null) {
        Log-Message "Response Headers:"
        foreach ($header in $response.Headers.GetEnumerator()) {
            Log-Message "$($header.Key): $($header.Value)"
        }
    } else {
        Log-Message "No headers found in the response."
    }

    # Log the response body (handle non-JSON content)
    try {
        $responseBody = $response.Content | ConvertTo-Json -Compress -ErrorAction Stop
        Log-Message "Response Body: $responseBody"
    } catch {
        Log-Message "Response Body: $($response.Content)"
    }
}
catch {
    # Log the error message
    $errorMessage = "Error: $($_.Exception.Message)"
    Log-Message $errorMessage

    # Correctly log the error record exception
    Log-Message "Error Response: $($_.ErrorRecord.Exception)"

    # Check if an error response is available
    $ErrorResponse = $_.Exception.Response

    if ($ErrorResponse) {
        # Log the error response body if available
        try {
            $ErrorContent = (New-Object System.IO.StreamReader($ErrorResponse.GetResponseStream())).ReadToEnd()
            Log-Message "Error Response Body: $ErrorContent"
        } catch {
            Log-Message "Failed to read error response body."
        }

        # Properly retrieve error response headers
        Log-Message "Error Response Headers:"
        foreach ($headerKey in $ErrorResponse.Headers.AllKeys) {
            $headerValue = $ErrorResponse.Headers.Get($headerKey)
            Log-Message "$headerKey: $headerValue"
        }
    } else {
        Log-Message "No error response object available."
    }
}

额外优化说明 #

• 增加了响应体转JSON的异常捕获，避免非JSON内容导致脚本中断
• 简化了错误响应对象的获取路径，直接使用$_.Exception.Response更简洁
• 对错误响应体的读取操作增加了异常处理，提升脚本稳定性

内容的提问来源于stack exchange，提问作者Preethi Ravi