From 45b8810ab8a888a1cf43aae308770d159a87e25f Mon Sep 17 00:00:00 2001
From: Craig Andrews <candrews@integralblue.com>
Date: Sun, 9 Feb 2025 21:55:16 -0500
Subject: [PATCH] [online_image] Set Accept header (#8216)

---
 .../components/online_image/online_image.cpp  | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/esphome/components/online_image/online_image.cpp b/esphome/components/online_image/online_image.cpp
index b08c14b721..da0e88a904 100644
--- a/esphome/components/online_image/online_image.cpp
+++ b/esphome/components/online_image/online_image.cpp
@@ -100,7 +100,35 @@ void OnlineImage::update() {
   }
   ESP_LOGI(TAG, "Updating image %s", this->url_.c_str());
 
-  this->downloader_ = this->parent_->get(this->url_);
+  std::list<http_request::Header> headers = {};
+
+  http_request::Header accept_header;
+  accept_header.name = "Accept";
+  std::string accept_mime_type;
+  switch (this->format_) {
+#ifdef USE_ONLINE_IMAGE_BMP_SUPPORT
+    case ImageFormat::BMP:
+      accept_mime_type = "image/bmp";
+      break;
+#endif  // ONLINE_IMAGE_BMP_SUPPORT
+#ifdef USE_ONLINE_IMAGE_JPEG_SUPPORT
+    case ImageFormat::JPEG:
+      accept_mime_type = "image/jpeg";
+      break;
+#endif  // USE_ONLINE_IMAGE_JPEG_SUPPORT
+#ifdef USE_ONLINE_IMAGE_PNG_SUPPORT
+    case ImageFormat::PNG:
+      accept_mime_type = "image/png";
+      break;
+#endif  // ONLINE_IMAGE_PNG_SUPPORT
+    default:
+      accept_mime_type = "image/*";
+  }
+  accept_header.value = (accept_mime_type + ",*/*;q=0.8").c_str();
+
+  headers.push_back(accept_header);
+
+  this->downloader_ = this->parent_->get(this->url_, headers);
 
   if (this->downloader_ == nullptr) {
     ESP_LOGE(TAG, "Download failed.");